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4(x+5)-5=21-3x-6+7x
We move all terms to the left:
4(x+5)-5-(21-3x-6+7x)=0
We add all the numbers together, and all the variables
4(x+5)-(4x+15)-5=0
We multiply parentheses
4x-(4x+15)+20-5=0
We get rid of parentheses
4x-4x-15+20-5=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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