7=4/5b-9

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Solution for 7=4/5b-9 equation: 


b in (-oo:+oo)

7 = (4/5)*b-9 // - (4/5)*b-9

7-((4/5)*b)+9 = 0

(-4/5)*b+7+9 = 0

16-4/5*b = 0 // - 16

-4/5*b = -16 // : -4/5

b = -16/(-4/5)

b = 20

b = 20

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