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6(b-7)+4(-6b+3)=42
We move all terms to the left:
6(b-7)+4(-6b+3)-(42)=0
We multiply parentheses
6b-24b-42+12-42=0
We add all the numbers together, and all the variables
-18b-72=0
We move all terms containing b to the left, all other terms to the right
-18b=72
b=72/-18
b=-4
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