-12=5a-2a+9

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


a in (-oo:+oo)

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

2*a-(5*a)-12-9 = 0

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

-3*a-21 = 0 // + 21

-3*a = 21 // : -3

a = 21/(-3)

a = -7

a = -7

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