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x+(5x-27)+(2x+40)=90
We move all terms to the left:
x+(5x-27)+(2x+40)-(90)=0
We get rid of parentheses
x+5x+2x-27+40-90=0
We add all the numbers together, and all the variables
8x-77=0
We move all terms containing x to the left, all other terms to the right
8x=77
x=77/8
x=9+5/8
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