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5+2=12-a
We simplify the equation to the form, which is simple to understand
5+2=12-a
We move all terms containing a to the left and all other terms to the right.
+1a=+12-5-2
We simplify left and right side of the equation.
+1a=+5
We divide both sides of the equation by 01 to get a.
a=5
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