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-11a+6a=-12(a-6)-9(-a+8)
We simplify the equation to the form, which is simple to understand
-11a+6a=-12(a-6)-9(-a+8)
Reorder the terms in parentheses
-11a+6a=+(-12a+72)-9*(-a+8)
Remove unnecessary parentheses
-11a+6a=-12a+72-9+*(-a+8+)
Reorder the terms in parentheses
-11a+6a=-12a+72+(+9a-72)
Remove unnecessary parentheses
-11a+6a=-12a+72+9a-72
We move all terms containing a to the left and all other terms to the right.
-11a+6a+12a-9a=+72-72
We simplify left and right side of the equation.
-2a=0
We divide both sides of the equation by -2 to get a.
a=-0
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