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-39-6a=-7a
We simplify the equation to the form, which is simple to understand
-39-6a=-7a
We move all terms containing a to the left and all other terms to the right.
-6a+7a=+39
We simplify left and right side of the equation.
+1a=+39
We divide both sides of the equation by 1 to get a.
a=39
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