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315=1.5b+2b
We move all terms to the left:
315-(1.5b+2b)=0
We add all the numbers together, and all the variables
-(+3.5b)+315=0
We get rid of parentheses
-3.5b+315=0
We move all terms containing b to the left, all other terms to the right
-3.5b=-315
b=-315/-3.5
b=+90
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