12=-1a+15

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Solution for 12=-1a+15 equation:


12=-1a+15

We simplify the equation to the form, which is simple to understand 
12=-1a+15

We move all terms containing a to the left and all other terms to the right. 
+1a=+15-12

We simplify left and right side of the equation. 
+1a=+3

We divide both sides of the equation by 01 to get a. 
a=3

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