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x in (-oo:+oo)
15*x = 7/8 // - 7/8
15*x-(7/8) = 0
15*x-7/8 = 0
15*x-7/8 = 0 // + 7/8
15*x = 7/8 // : 15
x = 7/8/15
x = 7/120
x = 7/120
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