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5(5x-7)-3x=21+8x
We move all terms to the left:
5(5x-7)-3x-(21+8x)=0
We add all the numbers together, and all the variables
5(5x-7)-3x-(8x+21)=0
We add all the numbers together, and all the variables
-3x+5(5x-7)-(8x+21)=0
We multiply parentheses
-3x+25x-(8x+21)-35=0
We get rid of parentheses
-3x+25x-8x-21-35=0
We add all the numbers together, and all the variables
14x-56=0
We move all terms containing x to the left, all other terms to the right
14x=56
x=56/14
x=4
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