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-b/7=-4
We move all terms to the left:
-b/7-(-4)=0
We add all the numbers together, and all the variables
-b/7+4=0
We multiply all the terms by the denominator
-b+4*7=0
We add all the numbers together, and all the variables
-1b+28=0
We move all terms containing b to the left, all other terms to the right
-b=-28
b=-28/-1
b=+28
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