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a+4a=144
We simplify the equation to the form, which is simple to understand
a+4a=144
We move all terms containing a to the left and all other terms to the right.
+1a+4a=+144
We simplify left and right side of the equation.
+5a=+144
We divide both sides of the equation by 5 to get a.
a=28.8
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