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-66=6(-1+5a)
We simplify the equation to the form, which is simple to understand
-66=6(-1+5a)
Reorder the terms in parentheses
-66=+(-6+30a)
Remove unnecessary parentheses
-66=-6+30a
We move all terms containing a to the left and all other terms to the right.
-30a=-6+66
We simplify left and right side of the equation.
-30a=+60
We divide both sides of the equation by -030 to get a.
a=-2
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