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x in (-oo:+oo)
x+1 = (-5/6)*x-(7/15) // - (-5/6)*x-(7/15)
x-((-5/6)*x)+7/15+1 = 0
x+(5/6)*x+7/15+1 = 0
11/6*x+22/15 = 0 // - 22/15
11/6*x = -22/15 // : 11/6
x = -22/15/11/6
x = -4/5
x = -4/5
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