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20+17b=-10+12b
We move all terms to the left:
20+17b-(-10+12b)=0
We add all the numbers together, and all the variables
17b-(12b-10)+20=0
We get rid of parentheses
17b-12b+10+20=0
We add all the numbers together, and all the variables
5b+30=0
We move all terms containing b to the left, all other terms to the right
5b=-30
b=-30/5
b=-6
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