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x in (-oo:+oo)
(x/5)/8 = 4/15 // - 4/15
(x/5)/8-(4/15) = 0
(x/5)/8-4/15 = 0
1/40*x-4/15 = 0 // + 4/15
1/40*x = 4/15 // : 1/40
x = 4/15/1/40
x = 32/3
x = 32/3
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