How do I Solve the hard algebra problems here?

I essentially have a clear understanding of algebra and can do up to level 3 problems in brilliant but I dont understand anything when it comes to 4 or 5 it jyust seems too hard.How can I learn what to do and how to solve.I cant even understand the solutions very well.please help.

#Algebra

Easy Math Editor

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`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
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`\sum_{i=1}^3`	$\sum_{i=1}^3$
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Comments

If you provide some examples of problems you're struggling with, I might be able to help! This question is kinda hard to answer without some hardcore examples. The more problems you do, the more you'll learn.

Callie Ferguson - 1 year, 9 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$