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7-b/8=-20
We move all terms to the left:
7-b/8-(-20)=0
We add all the numbers together, and all the variables
-b/8+27=0
We multiply all the terms by the denominator
-b+27*8=0
We add all the numbers together, and all the variables
-1b+216=0
We move all terms containing b to the left, all other terms to the right
-b=-216
b=-216/-1
b=+216
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