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-4a+7+5a=15-23
We simplify the equation to the form, which is simple to understand
-4a+7+5a=15-23
We move all terms containing a to the left and all other terms to the right.
-4a+5a=+15-23-7
We simplify left and right side of the equation.
+1a=-15
We divide both sides of the equation by 1 to get a.
a=-15
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