9=1-2b/5

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Solution for 9=1-2b/5 equation: 


b in (-oo:+oo)

9 = 1-((2*b)/5) // - 1-((2*b)/5)

(2*b)/5-1+9 = 0

2/5*b+8 = 0 // - 8

2/5*b = -8 // : 2/5

b = -8/2/5

b = -20

b = -20

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