-7a-7=-21

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Solution for -7a-7=-21 equation: 


a in (-oo:+oo)

-7*a-7 = -21 // + 21

21-7*a-7 = 0

14-7*a = 0 // - 14

-7*a = -14 // : -7

a = -14/(-7)

a = 2

a = 2

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