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x in (-oo:+oo)
(x-4)/10 = 3/5 // - 3/5
(x-4)/10-(3/5) = 0
(x-4)/10-3/5 = 0
(5*(x-4))/(5*10)+(-3*10)/(5*10) = 0
5*(x-4)-3*10 = 0
5*x-50 = 0
(5*x-50)/(5*10) = 0
(5*x-50)/(5*10) = 0 // * 5*10
5*x-50 = 0
5*x-50 = 0 // + 50
5*x = 50 // : 5
x = 50/5
x = 10
x = 10
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