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5n-2n=21
We simplify the equation to the form, which is simple to understand
5n-2n=21
We move all terms containing n to the left and all other terms to the right.
+5n-2n=+21
We simplify left and right side of the equation.
+3n=+21
We divide both sides of the equation by 3 to get n.
n=7
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