12-9=x/4

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Solution for 12-9=x/4 equation: 


x in (-oo:+oo)

12-9 = x/4 // - x/4

12-(x/4)-9 = 0

3-1/4*x = 0 // - 3

-1/4*x = -3 // : -1/4

x = -3/(-1/4)

x = 12

x = 12

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