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x in (-oo:+oo)
668 = (20*x+4)/3 // - (20*x+4)/3
668-((20*x+4)/3) = 0
(-1*(20*x+4))/3+668 = 0
(-1*(20*x+4))/3+(3*668)/3 = 0
3*668-1*(20*x+4) = 0
2000-20*x = 0
(2000-20*x)/3 = 0
(2000-20*x)/3 = 0 // * 3
2000-20*x = 0
2000-20*x = 0 // - 2000
-20*x = -2000 // : -20
x = -2000/(-20)
x = 100
x = 100
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