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3a-2a=9
We simplify the equation to the form, which is simple to understand
3a-2a=9
We move all terms containing a to the left and all other terms to the right.
+3a-2a=+9
We simplify left and right side of the equation.
+1a=+9
We divide both sides of the equation by 1 to get a.
a=9
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