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-63=-3a-5(a+3)
We simplify the equation to the form, which is simple to understand
-63=-3a-5(a+3)
Reorder the terms in parentheses
-63=-3a+(-5a-15)
Remove unnecessary parentheses
-63=-3a-5a-15
We move all terms containing a to the left and all other terms to the right.
+3a+5a=-15+63
We simplify left and right side of the equation.
+8a=+48
We divide both sides of the equation by 8 to get a.
a=6
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