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6a-3a-a-12=0
We simplify the equation to the form, which is simple to understand
6a-3a-a-12=0
We move all terms containing a to the left and all other terms to the right.
+6a-3a-1a=0+12
We simplify left and right side of the equation.
+2a=+12
We divide both sides of the equation by 2 to get a.
a=6
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