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9+a/7=-3
We move all terms to the left:
9+a/7-(-3)=0
We add all the numbers together, and all the variables
a/7+12=0
We multiply all the terms by the denominator
a+12*7=0
We add all the numbers together, and all the variables
a+84=0
We move all terms containing a to the left, all other terms to the right
a=-84
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