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x in (-oo:+oo)
(2*x+4)/10 = (x-8)/9 // - (x-8)/9
(2*x+4)/10-((x-8)/9) = 0
(2*x+4)/10+(-1*(x-8))/9 = 0
(9*(2*x+4))/(9*10)+(-1*10*(x-8))/(9*10) = 0
9*(2*x+4)-1*10*(x-8) = 0
8*x+116 = 0
(8*x+116)/(9*10) = 0
(8*x+116)/(9*10) = 0 // * 9*10
8*x+116 = 0
8*x+116 = 0 // - 116
8*x = -116 // : 8
x = -116/8
x = -29/2
x = -29/2
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