30=12+6a-3a

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Solution for 30=12+6a-3a equation:


30=12+6a-3a

We simplify the equation to the form, which is simple to understand 
30=12+6a-3a

We move all terms containing a to the left and all other terms to the right. 
-6a+3a=+12-30

We simplify left and right side of the equation. 
-3a=-18

We divide both sides of the equation by -3 to get a. 
a=6

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