Solve for x

Algebra Level 1

Solve:

2 3 x + 10 x 5 = 36 5 \large \dfrac{2}{3}x+10-\dfrac{x}{5}=\dfrac{36}{5}


The answer is -6.

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

2 solutions

2 3 x + 10 x 5 = 36 5 \dfrac{2}{3}x+10-\dfrac{x}{5}=\dfrac{36}{5}

The L C D LCD is 15 15 , multiply both sides of the equation by 15 15 .

( 2 3 x + 10 x 5 ) ( 15 ) = ( 36 5 ) ( 15 ) \left(\dfrac{2}{3}x+10-\dfrac{x}{5}\right)(15)=\left(\dfrac{36}{5}\right)(15)

10 x + 150 3 x = 108 10x+150-3x=108

Combine like terms.

7 x + 150 = 108 7x+150=108

Transpose 150 150 to the other side of the equation.

7 x = 108 150 7x=108-150

Combine like terms.

7 x = 42 7x=-42

Divide both sides 7 7 .

x = 6 \boxed{x=-6}

Verify the solution by substitution.

10 ( 6 ) + 150 3 ( 6 ) = 108 10(-6)+150-3(-6)=108

60 + 150 + 18 = 108 -60+150+18=108

108 = 108 \boxed{108=108} The statement is true. Therefore, -6 is the solution. \text{The statement is true. Therefore, -6 is the solution.}

I done this in my mind

genis dude - 3 years, 11 months ago

Log in to reply

very good!

A Former Brilliant Member - 3 years, 11 months ago
Mohammad Khaza
Jul 13, 2017

here it is:

2 x 3 \frac {2 x }{ 3} + 10 - x 5 \frac {x}{5} = 36 5 \frac {36}{5}

or, 2 x 3 \frac {2 x }{ 3} - x 5 \frac {x}{5} = 36 5 \frac {36}{5} - 10

or, 10 x 3 x 15 \frac {10 x -3 x }{15} = 210 -210

or, 35x =-210

or, x= -6

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...