X+1/3X=12 - solution

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Solution for X+1/3X=12 equation:

X in (-oo:+oo)

X+(1/3)*X = 12 // - 12

X+(1/3)*X-12 = 0

4/3*X-12 = 0 // + 12

4/3*X = 12 // : 4/3

X = 12/4/3

X = 9

X = 9

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