(X+20)+(x-30)=90

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Solution for (X+20)+(x-30)=90 equation: 



(X+20)+(X-30)=90

We move all terms to the left:

(X+20)+(X-30)-(90)=0

We get rid of parentheses

X+X+20-30-90=0

We add all the numbers together, and all the variables

2X-100=0

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

2X=100

X=100/2

X=50

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