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10(-2+b)=30
We move all terms to the left:
10(-2+b)-(30)=0
We add all the numbers together, and all the variables
10(b-2)-30=0
We multiply parentheses
10b-20-30=0
We add all the numbers together, and all the variables
10b-50=0
We move all terms containing b to the left, all other terms to the right
10b=50
b=50/10
b=5
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