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-a/13=-1
We simplify the equation to the form, which is simple to understand
-a/13=-1
Simplifying:
-0.0769230769231a=-1
We move all terms containing a to the left and all other terms to the right.
-0.0769230769231a=-1
We simplify left and right side of the equation.
-0.0769230769231a=-1
We divide both sides of the equation by -0.0769230769231 to get a.
a=13
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