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15-4b-7b=-1-6b-7
We move all terms to the left:
15-4b-7b-(-1-6b-7)=0
We add all the numbers together, and all the variables
-4b-7b-(-6b-8)+15=0
We add all the numbers together, and all the variables
-11b-(-6b-8)+15=0
We get rid of parentheses
-11b+6b+8+15=0
We add all the numbers together, and all the variables
-5b+23=0
We move all terms containing b to the left, all other terms to the right
-5b=-23
b=-23/-5
b=4+3/5
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