69=7a+5a+9

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Solution for 69=7a+5a+9 equation: 


a in (-oo:+oo)

69 = 7*a+5*a+9 // - 7*a+5*a+9

69-(7*a)-(5*a)-9 = 0

69-7*a-5*a-9 = 0

60-12*a = 0 // - 60

-12*a = -60 // : -12

a = -60/(-12)

a = 5

a = 5

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