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4n-21-2n=5n
We simplify the equation to the form, which is simple to understand
4n-21-2n=5n
We move all terms containing n to the left and all other terms to the right.
+4n-2n-5n=+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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