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