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4a-12=3-a-5
We simplify the equation to the form, which is simple to understand
4a-12=3-a-5
We move all terms containing a to the left and all other terms to the right.
+4a+1a=+3-5+12
We simplify left and right side of the equation.
+5a=+10
We divide both sides of the equation by 5 to get a.
a=2
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