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5+a/7=-2
We move all terms to the left:
5+a/7-(-2)=0
We add all the numbers together, and all the variables
a/7+7=0
We multiply all the terms by the denominator
a+7*7=0
We add all the numbers together, and all the variables
a+49=0
We move all terms containing a to the left, all other terms to the right
a=-49
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