X/12+9=21

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Solution for X/12+9=21 equation: 


X in (-oo:+oo)

X/12+9 = 21 // - 21

X/12-21+9 = 0

1/12*X-12 = 0 // + 12

1/12*X = 12 // : 1/12

X = 12/1/12

X = 144

X = 144

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