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-3x+6(7x-19)=81
We move all terms to the left:
-3x+6(7x-19)-(81)=0
We multiply parentheses
-3x+42x-114-81=0
We add all the numbers together, and all the variables
39x-195=0
We move all terms containing x to the left, all other terms to the right
39x=195
x=195/39
x=5
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