b/13-4b/13=21/13

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Solution for b/13-4b/13=21/13 equation:


b in (-oo:+oo)

b/13-((4*b)/13) = 21/13 // - 21/13

b/13-((4*b)/13)-(21/13) = 0

b/13+(-4/13)*b-21/13 = 0

-3/13*b-21/13 = 0 // + 21/13

-3/13*b = 21/13 // : -3/13

b = 21/13/(-3/13)

b = -7

b = -7

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