3/9=x/12

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Solution for 3/9=x/12 equation: 


x in (-oo:+oo)

3/9 = x/12 // - x/12

3/9-(x/12) = 0

1/3-1/12*x = 0 // - 1/3

-1/12*x = -1/3 // : -1/12

x = -1/3/(-1/12)

x = 4

x = 4

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