-7t=-21

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Solution for -7t=-21 equation: 


t in (-oo:+oo)

-7*t = -21 // + 21

21-7*t = 0

21-7*t = 0 // - 21

-7*t = -21 // : -7

t = -21/(-7)

t = 3

t = 3

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