6a+9+3a=-90

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Solution for 6a+9+3a=-90 equation: 


a in (-oo:+oo)

6*a+3*a+9 = -90 // + 90

6*a+3*a+9+90 = 0

9*a+99 = 0 // - 99

9*a = -99 // : 9

a = -99/9

a = -11

a = -11

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