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x in (-oo:+oo)
(3*x)/4 = 2/5 // - 2/5
(3*x)/4-(2/5) = 0
(3*x)/4-2/5 = 0
3/4*x-2/5 = 0 // + 2/5
3/4*x = 2/5 // : 3/4
x = 2/5/3/4
x = 8/15
x = 8/15
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