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-3x+4(3x+13)=-56
We move all terms to the left:
-3x+4(3x+13)-(-56)=0
We add all the numbers together, and all the variables
-3x+4(3x+13)+56=0
We multiply parentheses
-3x+12x+52+56=0
We add all the numbers together, and all the variables
9x+108=0
We move all terms containing x to the left, all other terms to the right
9x=-108
x=-108/9
x=-12
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