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x in (-oo:+oo)
(X-7)/10 = x/5 // - x/5
(X-7)/10-(x/5) = 0
(X-7)/10-x/5 = 0
(5*(X-7))/(5*10)+(10*(-x))/(5*10) = 0
5*(X-7)+10*(-x) = 0
5*X-10*x-35 = 0
(5*X-10*x-35)/(5*10) = 0
(5*X-10*x-35)/(5*10) = 0 // * 5*10
5*X-10*x-35 = 0
5*X-10*x-35 = 0 // - 5*X-35
-10*x = -(5*X-35) // : -10
x = (-(5*X-35))/(-10)
x = (35-(5*X))/(-10)
x = (35-(5*X))/(-10)
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