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90.2=-4.4(3b-6.4)
We move all terms to the left:
90.2-(-4.4(3b-6.4))=0
We calculate terms in parentheses: -(-4.4(3b-6.4)), so:We get rid of parentheses
-4.4(3b-6.4)
We multiply parentheses
-13.2b+28.16
Back to the equation:
-(-13.2b+28.16)
13.2b-28.16+90.2=0
We add all the numbers together, and all the variables
13.2b+62.04=0
We move all terms containing b to the left, all other terms to the right
13.2b=-62.04
b=-62.04/13.2
b=-4+7.4516129032258/10.645161290323
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