Beginning with 4n = 3.60, divide both sides of the equation by 4 to get 4n/4 = 3.60/4. Carrying out the division we get n = 0.9, the answer. You can multiply or divide both sides of any equation by the same number to help you isolate the value for which you wish to solve. The equation remains true whenever the same factor is applied to all terms in both sides. (Exception: cannot divide by zero.)
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4n = 48 4n/4 = 48/4 (Divide by 4 on both sides and then cancel) n = 12
The answer is n = 5.
3n + 4n = 42 7n = 42 n = 42/7 n = 6
4n + 3 = 15 4n +3 - 3 = 15 - 3 4n = 12 4n/4 = 12/4 n = 3
n = 1 7n + 6n - 5 = 4n + 4 13n - 5 = 4n + 4 13n - 4n - 5 = 4n - 4n + 4 9n - 5 = 4 9n -5 + 5 = 4 + 5 9n = 9 n = 1