3a-15=-21

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Solution for 3a-15=-21 equation:


3a-15=-21

We simplify the equation to the form, which is simple to understand 
3a-15=-21

We move all terms containing a to the left and all other terms to the right. 
+3a=-21+15

We simplify left and right side of the equation. 
+3a=-6

We divide both sides of the equation by 3 to get a. 
a=-2

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