-9+2a+7a=18

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Solution for -9+2a+7a=18 equation: 


a in (-oo:+oo)

2*a+7*a-9 = 18 // - 18

2*a+7*a-18-9 = 0

9*a-27 = 0 // + 27

9*a = 27 // : 9

a = 27/9

a = 3

a = 3

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