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h in (-oo:+oo)
h/108 = 7/18 // - 7/18
h/108-(7/18) = 0
h/108-7/18 = 0
1/108*h-7/18 = 0 // + 7/18
1/108*h = 7/18 // : 1/108
h = 7/18/1/108
h = 42
h = 42
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