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x+(2x-36)=90
We move all terms to the left:
x+(2x-36)-(90)=0
We get rid of parentheses
x+2x-36-90=0
We add all the numbers together, and all the variables
3x-126=0
We move all terms containing x to the left, all other terms to the right
3x=126
x=126/3
x=42
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