b/19-4b/19=21/19

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Solution for b/19-4b/19=21/19 equation: 


b in (-oo:+oo)

b/19-((4*b)/19) = 21/19 // - 21/19

b/19-((4*b)/19)-(21/19) = 0

b/19+(-4/19)*b-21/19 = 0

-3/19*b-21/19 = 0 // + 21/19

-3/19*b = 21/19 // : -3/19

b = 21/19/(-3/19)

b = -7

b = -7

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