-18=2a+7a+9

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


a in (-oo:+oo)

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

-(2*a)-(7*a)-18-9 = 0

-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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