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1 - 7n = 15 - 5n

Add 5n to each side: 1 - 7n + 5n = 15 -5n + 5n

ie 1 - 2n = 15; subtract 1 from each side: -2n = 14

divide both sides by -2: n = -7

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Q: How do you solve 1 minus 7n equals 15 minus 5n?
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