21-3b/-5

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Solution for 21-3b/-5 equation: 


b in (-oo:+oo)

2 < 1-((3*b)/(-5)) // - 1-((3*b)/(-5))

(3*b)/(-5)-1+2 < 0

1-3/5*b < 0 // - 1

-3/5*b < -1 // : -3/5

b > -1/(-3/5)

b > 5/3

b in (5/3:+oo)

(5/3:+oo)

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