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4(3x+20)=7x
We move all terms to the left:
4(3x+20)-(7x)=0
We add all the numbers together, and all the variables
-7x+4(3x+20)=0
We multiply parentheses
-7x+12x+80=0
We add all the numbers together, and all the variables
5x+80=0
We move all terms containing x to the left, all other terms to the right
5x=-80
x=-80/5
x=-16
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