70-x+(-x-20)=90

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Solution for 70-x+(-x-20)=90 equation: 



70-x+(-x-20)=90

We move all terms to the left:

70-x+(-x-20)-(90)=0

We add all the numbers together, and all the variables

-x+(-1x-20)+70-90=0

We add all the numbers together, and all the variables

-1x+(-1x-20)-20=0

We get rid of parentheses

-1x-1x-20-20=0

We add all the numbers together, and all the variables

-2x-40=0

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

-2x=40

x=40/-2

x=-20

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