4/10=x/30

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Solution for 4/10=x/30 equation: 


x in (-oo:+oo)

4/10 = x/30 // - x/30

4/10-(x/30) = 0

2/5-1/30*x = 0 // - 2/5

-1/30*x = -2/5 // : -1/30

x = -2/5/(-1/30)

x = 12

x = 12

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