--r/4=1/7

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Solution for --r/4=1/7 equation: 


r in (-oo:+oo)

-(-r/4) = 1/7 // - 1/7

-(-r/4)-(1/7) = 0

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

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

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

r = 1/7/1/4

r = 4/7

r = 4/7

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