-9-4a+a=-42

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Solution for -9-4a+a=-42 equation: 


a in (-oo:+oo)

a-(4*a)-9 = -42 // + 42

a-(4*a)-9+42 = 0

a-4*a-9+42 = 0

33-3*a = 0 // - 33

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

a = -33/(-3)

a = 11

a = 11

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