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x in (-oo:+oo)
(1/6)*(42-x) > 12 // - 12
(1/6)*(42-x)-12 > 0
1/6*(42-x)-12 > 0
1/6*(42-x)-12 > 0
-1/6*x-5 > 0
-1/6*x-5 > 0
-1/6*x-5 > 0 // + 5
-1/6*x > 5 // : -1/6
x < 5/(-1/6)
x < -30
(-oo:-30) (-30:+oo) -1/6*x-5 + -
x in (-oo:-30)
(-oo:-30)
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