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2(15+-0.5b)+b=30
We move all terms to the left:
2(15+-0.5b)+b-(30)=0
We add all the numbers together, and all the variables
2(-0.5b)+b-30=0
We add all the numbers together, and all the variables
b+2(-0.5b)-30=0
We multiply parentheses
b+0b-30=0
We add all the numbers together, and all the variables
2b-30=0
We move all terms containing b to the left, all other terms to the right
2b=30
b=30/2
b=15
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