4 + 4n - 12 = 4n - 8
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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
4n = 48 4n/4 = 48/4 (Divide by 4 on both sides and then cancel) n = 12
4
4n + 5