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2n-21=2n/3
We simplify the equation to the form, which is simple to understand
2n-21=2n/3
We move all terms containing n to the left and all other terms to the right.
+2n-0.66666666666667n=+21
We simplify left and right side of the equation.
+1.3333333333333n=+21
We divide both sides of the equation by 1.3333333333333 to get n.
n=15.75
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