9a+12-a=28

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Solution for 9a+12-a=28 equation:


9a+12-a=28

We simplify the equation to the form, which is simple to understand 
9a+12-a=28

We move all terms containing a to the left and all other terms to the right. 
+9a-1a=+28-12

We simplify left and right side of the equation. 
+8a=+16

We divide both sides of the equation by 8 to get a. 
a=2

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