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x in (-oo:+oo)
(18/19)*x = 21/19 // - 21/19
(18/19)*x-(21/19) = 0
(18/19)*x-21/19 = 0
18/19*x-21/19 = 0 // + 21/19
18/19*x = 21/19 // : 18/19
x = 21/19/18/19
x = 7/6
x = 7/6
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