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-31-19=13a
We simplify the equation to the form, which is simple to understand
-31-19=13a
We move all terms containing a to the left and all other terms to the right.
-13a=+31+19
We simplify left and right side of the equation.
-13a=+50
We divide both sides of the equation by -013 to get a.
a=-3.8461538461538
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