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-3a=4a+12
We simplify the equation to the form, which is simple to understand
-3a=4a+12
We move all terms containing a to the left and all other terms to the right.
-3a-4a=+12
We simplify left and right side of the equation.
-7a=+12
We divide both sides of the equation by -7 to get a.
a=-1.7142857142857
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