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x in (-oo:+oo)
(1/7)*x = (2/9)*(460-x) // - (2/9)*(460-x)
(1/7)*x-((2/9)*(460-x)) = 0
(-2/9)*(460-x)+(1/7)*x = 0
x/7-2/9*(460-x) = 0
(-2/9*7*(460-x))/7+x/7 = 0
x-2/9*7*(460-x) = 0
23/9*x-6440/9 = 0
(23/9*x-6440/9)/7 = 0
(23/9*x-6440/9)/7 = 0 // * 7
23/9*x-6440/9 = 0
23/9*x-6440/9 = 0 // + 6440/9
23/9*x = 6440/9 // : 23/9
x = 6440/9/23/9
x = 280
x = 280
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