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15+2b=55-2b
We move all terms to the left:
15+2b-(55-2b)=0
We add all the numbers together, and all the variables
2b-(-2b+55)+15=0
We get rid of parentheses
2b+2b-55+15=0
We add all the numbers together, and all the variables
4b-40=0
We move all terms containing b to the left, all other terms to the right
4b=40
b=40/4
b=10
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