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x in (-oo:+oo)
(1/5)*x+(1/8)*x = 2 // - 2
(1/5)*x+(1/8)*x-2 = 0
13/40*x-2 = 0 // + 2
13/40*x = 2 // : 13/40
x = 2/13/40
x = 80/13
x = 80/13
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