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(x-15)+(x-3)=90
We move all terms to the left:
(x-15)+(x-3)-(90)=0
We get rid of parentheses
x+x-15-3-90=0
We add all the numbers together, and all the variables
2x-108=0
We move all terms containing x to the left, all other terms to the right
2x=108
x=108/2
x=54
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