2/7+b=20/21

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Solution for 2/7+b=20/21 equation: 


b in (-oo:+oo)

b+2/7 = 20/21 // - 20/21

b+2/7-(20/21) = 0

b+2/7-20/21 = 0

b-2/3 = 0 // + 2/3

b = 2/3

b = 2/3

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