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-5x-6(2x+4)=129
We move all terms to the left:
-5x-6(2x+4)-(129)=0
We multiply parentheses
-5x-12x-24-129=0
We add all the numbers together, and all the variables
-17x-153=0
We move all terms containing x to the left, all other terms to the right
-17x=153
x=153/-17
x=-9
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