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9a-30=3a
We simplify the equation to the form, which is simple to understand
9a-30=3a
We move all terms containing a to the left and all other terms to the right.
+9a-3a=+30
We simplify left and right side of the equation.
+6a=+30
We divide both sides of the equation by 6 to get a.
a=5
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