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x in (-oo:+oo)
(3*x+4)/10 = x/5 // - x/5
(3*x+4)/10-(x/5) = 0
(3*x+4)/10-x/5 = 0
(5*(3*x+4))/(5*10)+(10*(-x))/(5*10) = 0
5*(3*x+4)+10*(-x) = 0
5*x+20 = 0
(5*x+20)/(5*10) = 0
(5*x+20)/(5*10) = 0 // * 5*10
5*x+20 = 0
5*x+20 = 0 // - 20
5*x = -20 // : 5
x = -20/5
x = -4
x = -4
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