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-78=6(-2+3a)
We simplify the equation to the form, which is simple to understand
-78=6(-2+3a)
Reorder the terms in parentheses
-78=+(-12+18a)
Remove unnecessary parentheses
-78=-12+18a
We move all terms containing a to the left and all other terms to the right.
-18a=-12+78
We simplify left and right side of the equation.
-18a=+66
We divide both sides of the equation by -018 to get a.
a=-3.66666666667
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