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x in (-oo:+oo)
(9/10)*x = 2/5 // - 2/5
(9/10)*x-(2/5) = 0
(9/10)*x-2/5 = 0
9/10*x-2/5 = 0 // + 2/5
9/10*x = 2/5 // : 9/10
x = 2/5/9/10
x = 4/9
x = 4/9
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