X/3+6=21 - solution

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Solution for X/3+6=21 equation:

X in (-oo:+oo)

X/3+6 = 21 // - 21

X/3-21+6 = 0

1/3*X-15 = 0 // + 15

1/3*X = 15 // : 1/3

X = 15/1/3

X = 45

X = 45

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