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x in (-oo:+oo)
4/5-4*x = -36/55 // + -36/55
4/5-4*x-(-36/55) = 0
4/5-4*x+36/55 = 0
16/11-4*x = 0 // - 16/11
-4*x = -16/11 // : -4
x = -16/11/(-4)
x = 4/11
x = 4/11
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