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-3a-9+4a=-4a-3
We simplify the equation to the form, which is simple to understand
-3a-9+4a=-4a-3
We move all terms containing a to the left and all other terms to the right.
-3a+4a+4a=-3+9
We simplify left and right side of the equation.
+5a=+6
We divide both sides of the equation by 5 to get a.
a=1.2
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