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x in (-oo:+oo)
(3*x)/4-(2/5) = 1/5 // - 1/5
(3*x)/4-(2/5)-(1/5) = 0
(3*x)/4-2/5-1/5 = 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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