20=2x-(15-7x)

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Solution for 20=2x-(15-7x) equation: 



20=2x-(15-7x)

We move all terms to the left:

20-(2x-(15-7x))=0

We add all the numbers together, and all the variables

-(2x-(-7x+15))+20=0



We calculate terms in parentheses: -(2x-(-7x+15)), so:

2x-(-7x+15)

We get rid of parentheses

2x+7x-15

We add all the numbers together, and all the variables

9x-15

Back to the equation:

-(9x-15)



We get rid of parentheses

-9x+15+20=0

We add all the numbers together, and all the variables

-9x+35=0

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

-9x=-35

x=-35/-9

x=3+8/9

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