77 + 7/7 = 78
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Expressed algebraically, this would equal 7s - 5.
L + S = 72 so L = 72 - S; 4L - 3S = 78 ie 4(72 - S) - 3S = 78 ie 288 - 4S - 3S = 78 ie 7S = 210 so S = 30 and L = 42. And there you have it!
Puto
7s + 12 = 131 Therefore, 7s = 119 s = 119/7 Therefore, s = 17
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