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

x-21*3-9 = 0

x-72 = 0

(x-72)/3 = 0

(x-72)/3 = 0 // * 3

x-72 = 0

x-72 = 0 // + 72

x = 72

x = 72

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