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2x-(4x-15)=3
We move all terms to the left:
2x-(4x-15)-(3)=0
We get rid of parentheses
2x-4x+15-3=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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