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239=5-6(-4+7a)
We simplify the equation to the form, which is simple to understand
239=5-6(-4+7a)
Reorder the terms in parentheses
239=5+(+24-42a)
Remove unnecessary parentheses
+239=+5+24-42a
We move all terms containing a to the left and all other terms to the right.
+42a=+5+24-239
We simplify left and right side of the equation.
+42a=-210
We divide both sides of the equation by 042 to get a.
a=-5
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