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6x-3(x=13)=-54
We move all terms to the left:
6x-3(x-(13))=0
We multiply parentheses
6x-3x+39=0
We add all the numbers together, and all the variables
3x+39=0
We move all terms containing x to the left, all other terms to the right
3x=-39
x=-39/3
x=-13
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