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-5+a/3=-7
We move all terms to the left:
-5+a/3-(-7)=0
We add all the numbers together, and all the variables
a/3+2=0
We multiply all the terms by the denominator
a+2*3=0
We add all the numbers together, and all the variables
a+6=0
We move all terms containing a to the left, all other terms to the right
a=-6
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