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11a+9=4a+40
We simplify the equation to the form, which is simple to understand
11a+9=4a+40
We move all terms containing a to the left and all other terms to the right.
+11a-4a=+40-9
We simplify left and right side of the equation.
+7a=+31
We divide both sides of the equation by 7 to get a.
a=4.42857142857
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