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5x-7(x-3)=15
We move all terms to the left:
5x-7(x-3)-(15)=0
We multiply parentheses
5x-7x+21-15=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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