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-3.3b=-12.4
We move all terms to the left:
-3.3b-(-12.4)=0
We add all the numbers together, and all the variables
-3.3b+12.4=0
We move all terms containing b to the left, all other terms to the right
-3.3b=-12.4
b=-12.4/-3.3
b=3+2.5/3.3
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