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x in (-oo:+oo)
(3*x)/7-(x/5) = 80 // - 80
(3*x)/7-(x/5)-80 = 0
8/35*x-80 = 0 // + 80
8/35*x = 80 // : 8/35
x = 80/8/35
x = 350
x = 350
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