-2b=-20

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Solution for -2b=-20 equation: 


b in (-oo:+oo)

-2*b = -20 // + 20

20-2*b = 0

20-2*b = 0 // - 20

-2*b = -20 // : -2

b = -20/(-2)

b = 10

b = 10

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