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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
5*X-10*x+60 = 0
(5*X-10*x+60)/(5*10) = 0
(5*X-10*x+60)/(5*10) = 0 // * 5*10
5*X-10*x+60 = 0
5*X-10*x+60 = 0 // - 5*X+60
-10*x = -(5*X+60) // : -10
x = (-(5*X+60))/(-10)
x = (5*X+60)/10
x = (5*X+60)/10
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