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1=a-13/(-6)
We move all terms to the left:
1-(a-13/(-6))=0
We multiply all the terms by the denominator
-(a-13+1*(-6))=0
We calculate terms in parentheses: -(a-13+1*(-6)), so:We get rid of parentheses
a-13+1*(-6)
We add all the numbers together, and all the variables
a-19
Back to the equation:
-(a-19)
-a+19=0
We add all the numbers together, and all the variables
-1a+19=0
We move all terms containing a to the left, all other terms to the right
-a=-19
a=-19/-1
a=+19
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