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39.99+.4n=55.99
We simplify the equation to the form, which is simple to understand
39.99+.4n=55.99
We move all terms containing n to the left and all other terms to the right.
+ 0.4n=+55.99-39.99
We simplify left and right side of the equation.
+ 0.4n=+16
We divide both sides of the equation by 0.4 to get n.
n=40
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