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4b-19=-4(b+3)-7
We move all terms to the left:
4b-19-(-4(b+3)-7)=0
We calculate terms in parentheses: -(-4(b+3)-7), so:We get rid of parentheses
-4(b+3)-7
We multiply parentheses
-4b-12-7
We add all the numbers together, and all the variables
-4b-19
Back to the equation:
-(-4b-19)
4b+4b+19-19=0
We add all the numbers together, and all the variables
8b=0
b=0/8
b=0
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