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x in (-oo:+oo)
x/7 = 1-(x/8) // - 1-(x/8)
x/7+x/8-1 = 0
15/56*x-1 = 0 // + 1
15/56*x = 1 // : 15/56
x = 1/15/56
x = 56/15
x = 56/15
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