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5(x+4)=8x-7
We move all terms to the left:
5(x+4)-(8x-7)=0
We multiply parentheses
5x-(8x-7)+20=0
We get rid of parentheses
5x-8x+7+20=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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