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492=3a-10a
We simplify the equation to the form, which is simple to understand
492=3a-10a
We move all terms containing a to the left and all other terms to the right.
-3a+10a=-492
We simplify left and right side of the equation.
+7a=-492
We divide both sides of the equation by 7 to get a.
a=-70.2857142857
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