(7+x)/3=9

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Solution for (7+x)/3=9 equation: 


x in (-oo:+oo)

(x+7)/3 = 9 // - 9

(x+7)/3-9 = 0

(x+7)/3+(-9*3)/3 = 0

x-9*3+7 = 0

x-20 = 0

(x-20)/3 = 0

(x-20)/3 = 0 // * 3

x-20 = 0

x-20 = 0 // + 20

x = 20

x = 20

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