12=-a/7

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Solution for 12=-a/7 equation: 


a in (-oo:+oo)

12 = -a/7 // + -a/7

12-(-a/7) = 0

(1/7)*a+12 = 0

1/7*a+12 = 0 // - 12

1/7*a = -12 // : 1/7

a = -12/1/7

a = -84

a = -84

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