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The sum of twice a number and 7 less than the number is the same as the difference between negative 31 and the number what is the number?
Wiki User
∙ 13y ago
2n + (n - 7) = -31 - n
3n - 7 = -31 - n
3n + n + 7 - 7 = -31 + 7 + n - n
4n = -24
4n/4 = -24/4
n = -6
Check:
2n + (n - 7) = -31 - n
2(-6) + [(-6) - 7) =? -31 - (-6)
-12 + [-6 + (-7)] =? -31 + 6
-12 + (-13) =? -25
-25 = -25 True
Wiki User
∙ 13y ago
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