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-21=4b+19-(-6)
We move all terms to the left:
-21-(4b+19-(-6))=0
We calculate terms in parentheses: -(4b+19-(-6)), so:We get rid of parentheses
4b+19-(-6)
We add all the numbers together, and all the variables
4b+25
Back to the equation:
-(4b+25)
-4b-25-21=0
We add all the numbers together, and all the variables
-4b-46=0
We move all terms containing b to the left, all other terms to the right
-4b=46
b=46/-4
b=-11+1/2
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