book Maths Puzzle Numerical Ability

3x+8+4x-x=26

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I just need to know if I am right or not. My question is Reduce the fraction
-20t^5 u^2 v^3
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48t^7 u^4 v

I think the answer is

-5v^2
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12t^2 u^2 how do i solve using a graph for these types of problems? x^3-1=2x^2-3x
or y=2x+10-x^2