12/30=x/90

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Solution for 12/30=x/90 equation: 


x in (-oo:+oo)

12/30 = x/90 // - x/90

12/30-(x/90) = 0

2/5-1/90*x = 0 // - 2/5

-1/90*x = -2/5 // : -1/90

x = -2/5/(-1/90)

x = 36

x = 36

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