3a+12--6a=-9

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Solution for 3a+12--6a=-9 equation:


3a+12--6a=-9

We simplify the equation to the form, which is simple to understand 
3a+12+6a=-9

We move all terms containing a to the left and all other terms to the right. 
+3a+6a=-9-12

We simplify left and right side of the equation. 
+9a=-21

We divide both sides of the equation by 9 to get a. 
a=-2.33333333333

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