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9a+11-5a=39
We simplify the equation to the form, which is simple to understand
9a+11-5a=39
We move all terms containing a to the left and all other terms to the right.
+9a-5a=+39-11
We simplify left and right side of the equation.
+4a=+28
We divide both sides of the equation by 4 to get a.
a=7
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