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(x-37)+(2x-15)=90
We move all terms to the left:
(x-37)+(2x-15)-(90)=0
We get rid of parentheses
x+2x-37-15-90=0
We add all the numbers together, and all the variables
3x-142=0
We move all terms containing x to the left, all other terms to the right
3x=142
x=142/3
x=47+1/3
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