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9=4a+,13
We simplify the equation to the form, which is simple to understand
9=4a+,13
We move all terms containing a to the left and all other terms to the right.
-4a=0.13-9
We simplify left and right side of the equation.
-4a=-8.87
We divide both sides of the equation by -04 to get a.
a=2.2175
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