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36=-4(-9b+9)
We move all terms to the left:
36-(-4(-9b+9))=0
We calculate terms in parentheses: -(-4(-9b+9)), so:We get rid of parentheses
-4(-9b+9)
We multiply parentheses
36b-36
Back to the equation:
-(36b-36)
-36b+36+36=0
We add all the numbers together, and all the variables
-36b+72=0
We move all terms containing b to the left, all other terms to the right
-36b=-72
b=-72/-36
b=+2
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