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3(b+10)=6b+15
We move all terms to the left:
3(b+10)-(6b+15)=0
We multiply parentheses
3b-(6b+15)+30=0
We get rid of parentheses
3b-6b-15+30=0
We add all the numbers together, and all the variables
-3b+15=0
We move all terms containing b to the left, all other terms to the right
-3b=-15
b=-15/-3
b=+5
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