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division n=3
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4n - 7n = 21(4-7) n =21-3n = 21divide both sides by -3n = -7
n = 3Solution:7n/21 = 17n = 1 * 217n = 21n = 21/7n = 3
3n+18 = 39 -4n 3n+4n = 39 -18 7n = 21 n = 3
7n = 91n = 91÷7n = 13
(10, 2)