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-7(4x+3)=-25x-21-3x
We move all terms to the left:
-7(4x+3)-(-25x-21-3x)=0
We add all the numbers together, and all the variables
-7(4x+3)-(-28x-21)=0
We multiply parentheses
-28x-(-28x-21)-21=0
We get rid of parentheses
-28x+28x+21-21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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