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7+2b=3.5
We move all terms to the left:
7+2b-(3.5)=0
We add all the numbers together, and all the variables
2b+3.5=0
We move all terms containing b to the left, all other terms to the right
2b=-3.5
b=-3.5/2
b=-1+1/1.3333333333333
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