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