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3+5a=a+15
We simplify the equation to the form, which is simple to understand
3+5a=a+15
We move all terms containing a to the left and all other terms to the right.
+5a-1a=+15-3
We simplify left and right side of the equation.
+4a=+12
We divide both sides of the equation by 4 to get a.
a=3
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