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x in (-oo:+oo)
(x+7)/10 = (x-8)/2+9/5 // - (x-8)/2+9/5
(x+7)/10-((x-8)/2)-(9/5) = 0
(x+7)/10-((x-8)/2)-9/5 = 0
(x+7)/10+(-1*(x-8))/2-9/5 = 0
(2*5*(x+7))/(2*5*10)+(-1*5*10*(x-8))/(2*5*10)+(-9*2*10)/(2*5*10) = 0
2*5*(x+7)-1*5*10*(x-8)-9*2*10 = 0
470-40*x-180 = 0
290-40*x = 0
(290-40*x)/(2*5*10) = 0
(290-40*x)/(2*5*10) = 0 // * 2*5*10
290-40*x = 0
290-40*x = 0 // - 290
-40*x = -290 // : -40
x = -290/(-40)
x = 29/4
x = 29/4
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