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4x+4(x+15)=700
We move all terms to the left:
4x+4(x+15)-(700)=0
We multiply parentheses
4x+4x+60-700=0
We add all the numbers together, and all the variables
8x-640=0
We move all terms containing x to the left, all other terms to the right
8x=640
x=640/8
x=80
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