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a+3a=15/2
We simplify the equation to the form, which is simple to understand
a+3a=15/2
Simplifying:
a+3a=+7.5
We move all terms containing a to the left and all other terms to the right.
+1a+3a=+7.5
We simplify left and right side of the equation.
+4a=+7.5
We divide both sides of the equation by 4 to get a.
a=1.875
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