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x in (-oo:+oo)
(3/4)*x = 12/20 // - 12/20
(3/4)*x-(12/20) = 0
(3/4)*x-3/5 = 0
3/4*x-3/5 = 0 // + 3/5
3/4*x = 3/5 // : 3/4
x = 3/5/3/4
x = 4/5
x = 4/5
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