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(12x-12)+(3x+48)=90
We move all terms to the left:
(12x-12)+(3x+48)-(90)=0
We get rid of parentheses
12x+3x-12+48-90=0
We add all the numbers together, and all the variables
15x-54=0
We move all terms containing x to the left, all other terms to the right
15x=54
x=54/15
x=3+3/5
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