2a+9+5a=-12

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Solution for 2a+9+5a=-12 equation: 


a in (-oo:+oo)

2*a+5*a+9 = -12 // + 12

2*a+5*a+9+12 = 0

7*a+21 = 0 // - 21

7*a = -21 // : 7

a = -21/7

a = -3

a = -3

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