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x in (-oo:+oo)
(1/3)*(4*x+20) = 3*x // - 3*x
(1/3)*(4*x+20)-(3*x) = 0
(1/3)*(4*x+20)-3*x = 0
1/3*(4*x+20)-3*x = 0
1/3*(4*x+20)-3*x = 0
20/3-5/3*x = 0
20/3-5/3*x = 0
20/3-5/3*x = 0 // - 20/3
-5/3*x = -20/3 // : -5/3
x = -20/3/(-5/3)
x = 4
x = 4
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