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(5x-30)-(2x+6)=12
We move all terms to the left:
(5x-30)-(2x+6)-(12)=0
We get rid of parentheses
5x-2x-30-6-12=0
We add all the numbers together, and all the variables
3x-48=0
We move all terms containing x to the left, all other terms to the right
3x=48
x=48/3
x=16
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