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x in (-oo:+oo)
15 = -((3*x)/8)-6 // + -((3*x)/8)-6
(3*x)/8+6+15 = 0
3/8*x+21 = 0 // - 21
3/8*x = -21 // : 3/8
x = -21/3/8
x = -56
x = -56
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