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x in (-oo:+oo)
3*x-(2/8) = 40 // - 40
3*x-(2/8)-40 = 0
3*x-1/4-40 = 0
3*x-161/4 = 0 // + 161/4
3*x = 161/4 // : 3
x = 161/4/3
x = 161/12
x = 161/12
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