7/12=r/30

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Solution for 7/12=r/30 equation: 


r in (-oo:+oo)

7/12 = r/30 // - r/30

7/12-(r/30) = 0

7/12-1/30*r = 0 // - 7/12

-1/30*r = -7/12 // : -1/30

r = -7/12/(-1/30)

r = 35/2

r = 35/2

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