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15 - 3 * k = 7
-3k = 7 - 15
-3k = -8
k = 8/3
k = 2 2/3
b)
2/3 * s - 6 = 24
2/3 * s = 24 + 6
2/3 * s = 30
s = 30 * 3/2
s = 15 * 3
s = 45