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x in (-oo:+oo)
S = 72-(x/60) // - 72-(x/60)
S+x/60-72 = 0
S+1/60*x-72 = 0 // - S-72
1/60*x = -(S-72) // : 1/60
x = (-(S-72))/1/60
x = 60*(72-S)
x = 60*(72-S)
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