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(3x-3)+(3x-12)=90
We move all terms to the left:
(3x-3)+(3x-12)-(90)=0
We get rid of parentheses
3x+3x-3-12-90=0
We add all the numbers together, and all the variables
6x-105=0
We move all terms containing x to the left, all other terms to the right
6x=105
x=105/6
x=17+1/2
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