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-6=a/7+4
We move all terms to the left:
-6-(a/7+4)=0
We get rid of parentheses
-a/7-4-6=0
We multiply all the terms by the denominator
-a-4*7-6*7=0
We add all the numbers together, and all the variables
-1a-70=0
We move all terms containing a to the left, all other terms to the right
-a=70
a=70/-1
a=-70
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