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15=4b+7
We move all terms to the left:
15-(4b+7)=0
We get rid of parentheses
-4b-7+15=0
We add all the numbers together, and all the variables
-4b+8=0
We move all terms containing b to the left, all other terms to the right
-4b=-8
b=-8/-4
b=+2
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