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