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-3b+2.5=-4
We move all terms to the left:
-3b+2.5-(-4)=0
We add all the numbers together, and all the variables
-3b+6.5=0
We move all terms containing b to the left, all other terms to the right
-3b=-6.5
b=-6.5/-3
b=2+0.5/3
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