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x in (-oo:+oo)
(1/8)*x+(2/8)*x-5 = 25 // - 25
(1/8)*x+(2/8)*x-25-5 = 0
3/8*x-30 = 0 // + 30
3/8*x = 30 // : 3/8
x = 30/3/8
x = 80
x = 80
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