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12+1.6b+11-18=20
We move all terms to the left:
12+1.6b+11-18-(20)=0
We add all the numbers together, and all the variables
1.6b-15=0
We move all terms containing b to the left, all other terms to the right
1.6b=15
b=15/1.6
b=9+0.6/1.6
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