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9+15=10a-7
We simplify the equation to the form, which is simple to understand
9+15=10a-7
We move all terms containing a to the left and all other terms to the right.
-10a=-7-9-15
We simplify left and right side of the equation.
-10a=-31
We divide both sides of the equation by -010 to get a.
a=3.1
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