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x in (-oo:+oo)
6-((1/3)*x) > -1 // + 1
1-((1/3)*x)+6 > 0
(-1/3)*x+1+6 > 0
7-1/3*x > 0 // - 7
-1/3*x > -7 // : -1/3
x < -7/(-1/3)
x < 21
x in (-oo:21)
(-oo:21)
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