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x in (-oo:+oo)
(4/15)*x = -16/55 // + -16/55
(4/15)*x-(-16/55) = 0
(4/15)*x+16/55 = 0
4/15*x+16/55 = 0 // - 16/55
4/15*x = -16/55 // : 4/15
x = -16/55/4/15
x = -12/11
x = -12/11
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