(15-a)/3=9

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Solution for (15-a)/3=9 equation: 


a in (-oo:+oo)

(15-a)/3 = 9 // - 9

(15-a)/3-9 = 0

(15-a)/3+(-9*3)/3 = 0

15-a-9*3 = 0

-a-12 = 0

(-a-12)/3 = 0

(-a-12)/3 = 0 // * 3

-a-12 = 0

-a-12 = 0 // + 12

-a = 12 // * -1

a = -12

a = -12

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