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12a-54=-4a
We simplify the equation to the form, which is simple to understand
12a-54=-4a
We move all terms containing a to the left and all other terms to the right.
+12a+4a=+54
We simplify left and right side of the equation.
+16a=+54
We divide both sides of the equation by 16 to get a.
a=3.375
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