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7+8(2-8b)=215
We move all terms to the left:
7+8(2-8b)-(215)=0
We add all the numbers together, and all the variables
8(-8b+2)+7-215=0
We add all the numbers together, and all the variables
8(-8b+2)-208=0
We multiply parentheses
-64b+16-208=0
We add all the numbers together, and all the variables
-64b-192=0
We move all terms containing b to the left, all other terms to the right
-64b=192
b=192/-64
b=-3
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