39/4=r/12 - solution

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Solution for 39/4=r/12 equation:

r in (-oo:+oo)

39/4 = r/12 // - r/12

39/4-(r/12) = 0

39/4-1/12*r = 0 // - 39/4

-1/12*r = -39/4 // : -1/12

r = -39/4/(-1/12)

r = 117

r = 117

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