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x in (-oo:+oo)
(5*x)/8+12 = -9 // + 9
(5*x)/8+9+12 = 0
5/8*x+21 = 0 // - 21
5/8*x = -21 // : 5/8
x = -21/5/8
x = -168/5
x = -168/5
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