x(6x-21)/2

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Solution for x(6x-21)/2 equation: 


x in (-oo:+oo)

x < (6*x-21)/2 // - (6*x-21)/2

x-((6*x-21)/2) < 0

(-1*(6*x-21))/2+x < 0

(-1*(6*x-21))/2+(2*x)/2 < 0

2*x-1*(6*x-21) < 0

21-4*x < 0

(21-4*x)/2 < 0

(21-4*x)/2 < 0 // * 2^2

2*(21-4*x) < 0

( 2 )

2 < 0

x belongs to the empty set

( 21-4*x )

21-4*x < 0 // - 21

-4*x < -21 // : -4

x > -21/(-4)

x > 21/4

	(-oo:21/4)	(21/4:+oo)
2	+	+
21-4*x	+	-


x in (21/4:+oo)

(21/4:+oo)

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