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x in (-oo:+oo)
(10/15)*x = 12/15 // - 12/15
(10/15)*x-(12/15) = 0
(10/15)*x-4/5 = 0
2/3*x-4/5 = 0 // + 4/5
2/3*x = 4/5 // : 2/3
x = 4/5/2/3
x = 6/5
x = 6/5
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