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