(x+20)+(x-10)=90

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Solution for (x+20)+(x-10)=90 equation: 



(x+20)+(x-10)=90

We move all terms to the left:

(x+20)+(x-10)-(90)=0

We get rid of parentheses

x+x+20-10-90=0

We add all the numbers together, and all the variables

2x-80=0

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

2x=80

x=80/2

x=40

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