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12-2a=a-3
We simplify the equation to the form, which is simple to understand
12-2a=a-3
We move all terms containing a to the left and all other terms to the right.
-2a-1a=-3-12
We simplify left and right side of the equation.
-3a=-15
We divide both sides of the equation by -3 to get a.
a=5
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