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2b-7=6b-15
We move all terms to the left:
2b-7-(6b-15)=0
We get rid of parentheses
2b-6b+15-7=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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