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13+45a=20-15a
We simplify the equation to the form, which is simple to understand
13+45a=20-15a
We move all terms containing a to the left and all other terms to the right.
+45a+15a=+20-13
We simplify left and right side of the equation.
+60a=+7
We divide both sides of the equation by 60 to get a.
a=0.116666666667
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