x/3-4=21 - solution

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Solution for x/3-4=21 equation:

x in (-oo:+oo)

x/3-4 = 21 // - 21

x/3-21-4 = 0

1/3*x-25 = 0 // + 25

1/3*x = 25 // : 1/3

x = 25/1/3

x = 75

x = 75

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