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x in (-oo:+oo)
(6/25)*x = 9/10 // - 9/10
(6/25)*x-(9/10) = 0
(6/25)*x-9/10 = 0
6/25*x-9/10 = 0 // + 9/10
6/25*x = 9/10 // : 6/25
x = 9/10/6/25
x = 15/4
x = 15/4
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