20=b/7

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Solution for 20=b/7 equation: 


b in (-oo:+oo)

20 = b/7 // - b/7

20-(b/7) = 0

20-1/7*b = 0 // - 20

-1/7*b = -20 // : -1/7

b = -20/(-1/7)

b = 140

b = 140

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