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x in (-oo:+oo)
(x-7)/5+2 = (x+8)/10 // - (x+8)/10
(x-7)/5-((x+8)/10)+2 = 0
(x-7)/5+(-1*(x+8))/10+2 = 0
(10*(x-7))/(5*10)+(-1*5*(x+8))/(5*10)+(2*5*10)/(5*10) = 0
10*(x-7)-1*5*(x+8)+2*5*10 = 0
5*x-110+100 = 0
5*x-10 = 0
(5*x-10)/(5*10) = 0
(5*x-10)/(5*10) = 0 // * 5*10
5*x-10 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x = 2
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