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6x-(3x+15)=3
We move all terms to the left:
6x-(3x+15)-(3)=0
We get rid of parentheses
6x-3x-15-3=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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