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99=3(7-6a)+5a
We simplify the equation to the form, which is simple to understand
99=3(7-6a)+5a
Reorder the terms in parentheses
99=+(+21-18a)+5a
Remove unnecessary parentheses
+99=+21-18a+5a
We move all terms containing a to the left and all other terms to the right.
+18a-5a=+21-99
We simplify left and right side of the equation.
+13a=-78
We divide both sides of the equation by 13 to get a.
a=-6
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