(X)+(x+20)=90

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



(X)+(X+20)=90

We move all terms to the left:

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

We get rid of parentheses

X+X+20-90=0

We add all the numbers together, and all the variables

2X-70=0

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

2X=70

X=70/2

X=35

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