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9+7a-2-10a=0
We simplify the equation to the form, which is simple to understand
9+7a-2-10a=0
We move all terms containing a to the left and all other terms to the right.
+7a-10a=0-9+2
We simplify left and right side of the equation.
-3a=-7
We divide both sides of the equation by -3 to get a.
a=2.33333333333
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