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-7a+4+8a=15-24
We simplify the equation to the form, which is simple to understand
-7a+4+8a=15-24
We move all terms containing a to the left and all other terms to the right.
-7a+8a=+15-24-4
We simplify left and right side of the equation.
+1a=-13
We divide both sides of the equation by 1 to get a.
a=-13
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