2/10=b/-20

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Solution for 2/10=b/-20 equation: 


b in (-oo:+oo)

2/10 = b/(-20) // - b/(-20)

2/10-(b/(-20)) = 0

1/20*b+1/5 = 0 // - 1/5

1/20*b = -1/5 // : 1/20

b = -1/5/1/20

b = -4

b = -4

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