-2m-1=-21

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Solution for -2m-1=-21 equation: 


m in (-oo:+oo)

-2*m-1 = -21 // + 21

21-2*m-1 = 0

20-2*m = 0 // - 20

-2*m = -20 // : -2

m = -20/(-2)

m = 10

m = 10

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