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x in (-oo:+oo)
(x-3)/40 = 6/48 // - 6/48
(x-3)/40-(6/48) = 0
(x-3)/40-1/8 = 0
(8*(x-3))/(8*40)+(-1*40)/(8*40) = 0
8*(x-3)-1*40 = 0
8*x-64 = 0
(8*x-64)/(8*40) = 0
(8*x-64)/(8*40) = 0 // * 8*40
8*x-64 = 0
8*x-64 = 0 // + 64
8*x = 64 // : 8
x = 64/8
x = 8
x = 8
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