-9-3a=-42

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Solution for -9-3a=-42 equation: 


a in (-oo:+oo)

-(3*a)-9 = -42 // + 42

42-(3*a)-9 = 0

42-3*a-9 = 0

33-3*a = 0 // - 33

-3*a = -33 // : -3

a = -33/(-3)

a = 11

a = 11

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