(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+(3*9)/3 = 0

3*9-a+15 = 0

42-a = 0

(42-a)/3 = 0

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

42-a = 0

42-a = 0 // - 42

-a = -42 // * -1

a = 42

a = 42

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