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x in (-oo:+oo)
x/10 = (1/9)*(247-x) // - (1/9)*(247-x)
x/10-((1/9)*(247-x)) = 0
(-1/9)*(247-x)+x/10 = 0
x/10-1/9*(247-x) = 0
(-1/9*10*(247-x))/10+x/10 = 0
x-1/9*10*(247-x) = 0
19/9*x-2470/9 = 0
(19/9*x-2470/9)/10 = 0
(19/9*x-2470/9)/10 = 0 // * 10
19/9*x-2470/9 = 0
19/9*x-2470/9 = 0 // + 2470/9
19/9*x = 2470/9 // : 19/9
x = 2470/9/19/9
x = 130
x = 130
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