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5(x-5)+4=-7x-21
We move all terms to the left:
5(x-5)+4-(-7x-21)=0
We multiply parentheses
5x-(-7x-21)-25+4=0
We get rid of parentheses
5x+7x+21-25+4=0
We add all the numbers together, and all the variables
12x=0
x=0/12
x=0
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