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x in (-oo:+oo)
(5*x+35)/8 = -5 // + 5
(5*x+35)/8+5 = 0
(5*x+35)/8+(5*8)/8 = 0
5*x+5*8+35 = 0
5*x+75 = 0
(5*x+75)/8 = 0
(5*x+75)/8 = 0 // * 8
5*x+75 = 0
5*x+75 = 0 // - 75
5*x = -75 // : 5
x = -75/5
x = -15
x = -15
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