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x in (-oo:+oo)
(1/8)*x = -9-6 // + -9-6
(1/8)*x+6+9 = 0
1/8*x+15 = 0 // - 15
1/8*x = -15 // : 1/8
x = -15/1/8
x = -120
x = -120
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