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x in (-oo:+oo)
99 = (-11/5)*x // - (-11/5)*x
99-((-11/5)*x) = 0
(11/5)*x+99 = 0
11/5*x+99 = 0 // - 99
11/5*x = -99 // : 11/5
x = -99/11/5
x = -45
x = -45
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