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x in (-oo:+oo)
(3/10)*x = 11/15 // - 11/15
(3/10)*x-(11/15) = 0
(3/10)*x-11/15 = 0
3/10*x-11/15 = 0 // + 11/15
3/10*x = 11/15 // : 3/10
x = 11/15/3/10
x = 22/9
x = 22/9
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