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x in (-oo:+oo)
(3*(x-4))/12 < (2*x)/3 // - (2*x)/3
(3*(x-4))/12-((2*x)/3) < 0
(3*(x-4))/12+(-2/3)*x < 0
(3*(x-4))/12+(-2*x)/3 < 0
(3^2*(x-4))/(3*12)+(-2*12*x)/(3*12) < 0
3^2*(x-4)-2*12*x < 0
-15*x-36 < 0
(-15*x-36)/(3*12) < 0
(-15*x-36)/(3*12) < 0 // * (3*12)^2
3*12*(-15*x-36) < 0
( -15*x-36 )
-15*x-36 < 0 // + 36
-15*x < 36 // : -15
x > 36/(-15)
x > -12/5
( 12 )
12 < 0
x belongs to the empty set
( 3 )
3 < 0
x belongs to the empty set
(-oo:-12/5) (-12/5:+oo) -15*x-36 + - 12 + + 3 + +
x in (-12/5:+oo)
(-12/5:+oo)
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