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5x-(15-x)=3
We move all terms to the left:
5x-(15-x)-(3)=0
We add all the numbers together, and all the variables
5x-(-1x+15)-3=0
We get rid of parentheses
5x+1x-15-3=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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