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3.5b-2.7b=-6
We move all terms to the left:
3.5b-2.7b-(-6)=0
We add all the numbers together, and all the variables
0.8b+6=0
We move all terms containing b to the left, all other terms to the right
0.8b=-6
b=-6/0.8
b=-7+0.4/0.8
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