x/3+9=12 - solution

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Solution for x/3+9=12 equation:

x in (-oo:+oo)

x/3+9 = 12 // - 12

x/3-12+9 = 0

1/3*x-3 = 0 // + 3

1/3*x = 3 // : 1/3

x = 3/1/3

x = 9

x = 9

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