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x in (-oo:+oo)
20/9 = (-4/5)*x // - (-4/5)*x
20/9-((-4/5)*x) = 0
(4/5)*x+20/9 = 0
4/5*x+20/9 = 0 // - 20/9
4/5*x = -20/9 // : 4/5
x = -20/9/4/5
x = -25/9
x = -25/9
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