(x-9)/3=-21

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Solution for (x-9)/3=-21 equation: 


x in (-oo:+oo)

(x-9)/3 = -21 // + 21

(x-9)/3+21 = 0

(x-9)/3+(3*21)/3 = 0

x+3*21-9 = 0

x+54 = 0

(x+54)/3 = 0

(x+54)/3 = 0 // * 3

x+54 = 0

x+54 = 0 // - 54

x = -54

x = -54

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