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-5a-2=13
We simplify the equation to the form, which is simple to understand
-5a-2=13
We move all terms containing a to the left and all other terms to the right.
-5a=+13+2
We simplify left and right side of the equation.
-5a=+15
We divide both sides of the equation by -5 to get a.
a=-3
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