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13(12x-3)=7
We move all terms to the left:
13(12x-3)-(7)=0
We multiply parentheses
156x-39-7=0
We add all the numbers together, and all the variables
156x-46=0
We move all terms containing x to the left, all other terms to the right
156x=46
x=46/156
x=23/78
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