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(x-36)+x=90
We move all terms to the left:
(x-36)+x-(90)=0
We add all the numbers together, and all the variables
x+(x-36)-90=0
We get rid of parentheses
x+x-36-90=0
We add all the numbers together, and all the variables
2x-126=0
We move all terms containing x to the left, all other terms to the right
2x=126
x=126/2
x=63
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