7x+2(x-1)+20=90

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Solution for 7x+2(x-1)+20=90 equation: 



7x+2(x-1)+20=90

We move all terms to the left:

7x+2(x-1)+20-(90)=0

We add all the numbers together, and all the variables

7x+2(x-1)-70=0

We multiply parentheses

7x+2x-2-70=0

We add all the numbers together, and all the variables

9x-72=0

We move all terms containing x to the left, all other terms to the right

9x=72

x=72/9

x=8

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