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-8/a+9=-10
We simplify the equation to the form, which is simple to understand
-8/a+9=-10
We move all terms containing a to the left and all other terms to the right.
+1a=-10-9
We simplify left and right side of the equation.
+1a=-19
We divide both sides of the equation by 1 to get a.
a=-19
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