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90=(2b-9)+15+1.5(b+2)+b
We move all terms to the left:
90-((2b-9)+15+1.5(b+2)+b)=0
We calculate terms in parentheses: -((2b-9)+15+1.5(b+2)+b), so:We get rid of parentheses
(2b-9)+15+1.5(b+2)+b
determiningTheFunctionDomain (2b-9)+1.5(b+2)+b+15
We add all the numbers together, and all the variables
b+(2b-9)+1.5(b+2)+15
We multiply parentheses
b+(2b-9)+1.5b+3+15
We get rid of parentheses
b+2b+1.5b-9+3+15
We add all the numbers together, and all the variables
4.5b+9
Back to the equation:
-(4.5b+9)
-4.5b-9+90=0
We add all the numbers together, and all the variables
-4.5b+81=0
We move all terms containing b to the left, all other terms to the right
-4.5b=-81
b=-81/-4.5
b=+18
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