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-b/2+9=-3
We move all terms to the left:
-b/2+9-(-3)=0
We add all the numbers together, and all the variables
-b/2+12=0
We multiply all the terms by the denominator
-b+12*2=0
We add all the numbers together, and all the variables
-1b+24=0
We move all terms containing b to the left, all other terms to the right
-b=-24
b=-24/-1
b=+24
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