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3(12x+17)+13(-3x-8)=7
We move all terms to the left:
3(12x+17)+13(-3x-8)-(7)=0
We multiply parentheses
36x-39x+51-104-7=0
We add all the numbers together, and all the variables
-3x-60=0
We move all terms containing x to the left, all other terms to the right
-3x=60
x=60/-3
x=-20
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