-4=a/7

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Solution for -4=a/7 equation: 


a in (-oo:+oo)

-4 = a/7 // - a/7

-(a/7)-4 = 0

-1/7*a-4 = 0 // + 4

-1/7*a = 4 // : -1/7

a = 4/(-1/7)

a = -28

a = -28

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