7-m-3m=-21

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Solution for 7-m-3m=-21 equation: 


m in (-oo:+oo)

7-m-(3*m) = -21 // + 21

7-m-(3*m)+21 = 0

7-m-3*m+21 = 0

28-4*m = 0 // - 28

-4*m = -28 // : -4

m = -28/(-4)

m = 7

m = 7

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