7=r/4

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Solution for 7=r/4 equation: 


r in (-oo:+oo)

7 = r/4 // - r/4

7-(r/4) = 0

7-1/4*r = 0 // - 7

-1/4*r = -7 // : -1/4

r = -7/(-1/4)

r = 28

r = 28

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