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12/7 = x/s // - x/s
12/7-(x/s) = 0
12/7-s^-1*x = 0 // - 12/7
-s^-1*x = -12/7 // : -s^-1
x = -12/7/(-s^-1)
x = 12/7/(s^-1)
x = 12/7/(s^-1)
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