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-7x+4(4x+5)=128
We move all terms to the left:
-7x+4(4x+5)-(128)=0
We multiply parentheses
-7x+16x+20-128=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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