-99=-3a-6a-9

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Solution for -99=-3a-6a-9 equation: 


a in (-oo:+oo)

-99 = -3*a-(6*a)-9 // + -3*a-(6*a)-9

6*a-(-3*a)-99+9 = 0

3*a+6*a-99+9 = 0

9*a-90 = 0 // + 90

9*a = 90 // : 9

a = 90/9

a = 10

a = 10

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