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51=11b-15
We move all terms to the left:
51-(11b-15)=0
We get rid of parentheses
-11b+15+51=0
We add all the numbers together, and all the variables
-11b+66=0
We move all terms containing b to the left, all other terms to the right
-11b=-66
b=-66/-11
b=+6
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