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-11=-3(1+2a)+7(4+6a)
We simplify the equation to the form, which is simple to understand
-11=-3(1+2a)+7(4+6a)
Reorder the terms in parentheses
-11=+(-3-6a)+7*(4+6a)
Remove unnecessary parentheses
-11=-3-6a+7+*(+4+6a+)
Reorder the terms in parentheses
-11=-3-6a+(+28+42a)
Remove unnecessary parentheses
-11=-3-6a+28+42a
We move all terms containing a to the left and all other terms to the right.
+6a-42a=-3+28+11
We simplify left and right side of the equation.
-36a=+36
We divide both sides of the equation by -36 to get a.
a=-1
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