-4m+7=-21

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Solution for -4m+7=-21 equation: 


m in (-oo:+oo)

7-4*m = -21 // + 21

7-4*m+21 = 0

28-4*m = 0 // - 28

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

m = -28/(-4)

m = 7

m = 7

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