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n/2+2.5n=18
We simplify the equation to the form, which is simple to understand
n/2+2.5n=18
We move all terms containing n to the left and all other terms to the right.
+ 0.5n+2.5n=+18
We simplify left and right side of the equation.
+3n=+18
We divide both sides of the equation by 3 to get n.
n=6
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