81=4a+2a+9

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Solution for 81=4a+2a+9 equation: 


a in (-oo:+oo)

81 = 4*a+2*a+9 // - 4*a+2*a+9

81-(4*a)-(2*a)-9 = 0

81-4*a-2*a-9 = 0

72-6*a = 0 // - 72

-6*a = -72 // : -6

a = -72/(-6)

a = 12

a = 12

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