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(x+36)+2x=90
We move all terms to the left:
(x+36)+2x-(90)=0
We add all the numbers together, and all the variables
2x+(x+36)-90=0
We get rid of parentheses
2x+x+36-90=0
We add all the numbers together, and all the variables
3x-54=0
We move all terms containing x to the left, all other terms to the right
3x=54
x=54/3
x=18
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