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x in (-oo:+oo)
(3/4)*x = 12/15 // - 12/15
(3/4)*x-(12/15) = 0
(3/4)*x-4/5 = 0
3/4*x-4/5 = 0 // + 4/5
3/4*x = 4/5 // : 3/4
x = 4/5/3/4
x = 16/15
x = 16/15
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