-7/2a=21

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Solution for -7/2a=21 equation: 


a in (-oo:+oo)

(-7/2)*a = 21 // - 21

(-7/2)*a-21 = 0

-7/2*a-21 = 0 // + 21

-7/2*a = 21 // : -7/2

a = 21/(-7/2)

a = -6

a = -6

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