(X-42)+(x)=90

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Solution for (X-42)+(x)=90 equation: 



(X-42)+(X)=90

We move all terms to the left:

(X-42)+(X)-(90)=0

We add all the numbers together, and all the variables

X+(X-42)-90=0

We get rid of parentheses

X+X-42-90=0

We add all the numbers together, and all the variables

2X-132=0

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

2X=132

X=132/2

X=66

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