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$x + 4(2)=12\implies \boxed{x = 4}$

We can simplify the equation to get

x + 4(2) = 12

Multiply 4 by 2

x + 8 = 12

Move 8 to the right side of the equation and change the 8 into negative 8, '-8 '

x = 12 - 8

Subtract 8 from 12

x= 4

$y = 2$

$x + 4(2) = x + 8 = 12$

$x = 12 - 8 = \fbox 4$

Given that $y=4$ , the equation becomes $x+8 = 12$ . This can be rearranged and we see that $x = 12-8 = \boxed{4}$