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x in (-oo:+oo)
(3+16)/3 = 3*x // - 3*x
(3+16)/3-(3*x) = 0
(3+16)/3-3*x = 0
19/3-3*x = 0 // - 19/3
-3*x = -19/3 // : -3
x = -19/3/(-3)
x = 19/9
x = 19/9
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