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7.5=3b-6
We move all terms to the left:
7.5-(3b-6)=0
We get rid of parentheses
-3b+6+7.5=0
We add all the numbers together, and all the variables
-3b+13.5=0
We move all terms containing b to the left, all other terms to the right
-3b=-13.5
b=-13.5/-3
b=4+1/2
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