15=-3a+5a+9

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Solution for 15=-3a+5a+9 equation: 


a in (-oo:+oo)

15 = 5*a-3*a+9 // - 5*a-3*a+9

15-(-3*a)-(5*a)-9 = 0

3*a-5*a-9+15 = 0

6-2*a = 0 // - 6

-2*a = -6 // : -2

a = -6/(-2)

a = 3

a = 3

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