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17=a/7-2
We move all terms to the left:
17-(a/7-2)=0
We get rid of parentheses
-a/7+2+17=0
We multiply all the terms by the denominator
-a+2*7+17*7=0
We add all the numbers together, and all the variables
-1a+133=0
We move all terms containing a to the left, all other terms to the right
-a=-133
a=-133/-1
a=+133
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