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7x-3(4x-2)=51
We move all terms to the left:
7x-3(4x-2)-(51)=0
We multiply parentheses
7x-12x+6-51=0
We add all the numbers together, and all the variables
-5x-45=0
We move all terms containing x to the left, all other terms to the right
-5x=45
x=45/-5
x=-9
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