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-3+12a=-4+11a
We simplify the equation to the form, which is simple to understand
-3+12a=-4+11a
We move all terms containing a to the left and all other terms to the right.
+12a-11a=-4+3
We simplify left and right side of the equation.
+1a=-1
We divide both sides of the equation by 1 to get a.
a=-1
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