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x in (-oo:+oo)
(1/5)*x-(3/8) = 1/4 // - 1/4
(1/5)*x-(3/8)-(1/4) = 0
(1/5)*x-3/8-1/4 = 0
1/5*x-5/8 = 0 // + 5/8
1/5*x = 5/8 // : 1/5
x = 5/8/1/5
x = 25/8
x = 25/8
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