Find the number, n

​4 more than twice a number n is equal to 25.  What is n?

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4 + 2n = 25   {four more than twice n is 25}
-4           -4
2n = 21   {subtracted 4 from each side}
n = 21/2   {divided each side by 2}
n = 10.5   {divided 21 by 2}

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