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x in (-oo:+oo)
(x-2)/10 = (x-7)/5 // - (x-7)/5
(x-2)/10-((x-7)/5) = 0
(x-2)/10+(-1*(x-7))/5 = 0
(5*(x-2))/(5*10)+(-1*10*(x-7))/(5*10) = 0
5*(x-2)-1*10*(x-7) = 0
60-5*x = 0
(60-5*x)/(5*10) = 0
(60-5*x)/(5*10) = 0 // * 5*10
60-5*x = 0
60-5*x = 0 // - 60
-5*x = -60 // : -5
x = -60/(-5)
x = 12
x = 12
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