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3-3b+6b=-15+6b
We move all terms to the left:
3-3b+6b-(-15+6b)=0
We add all the numbers together, and all the variables
-3b+6b-(6b-15)+3=0
We add all the numbers together, and all the variables
3b-(6b-15)+3=0
We get rid of parentheses
3b-6b+15+3=0
We add all the numbers together, and all the variables
-3b+18=0
We move all terms containing b to the left, all other terms to the right
-3b=-18
b=-18/-3
b=+6
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