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

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Solution for (r+(4/7))(r-(4/7))=0 equation: 


r in (-oo:+oo)

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

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

( r+4/7 )

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

r = -4/7

( r-4/7 )

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

r = 4/7

r in { -4/7, 4/7 }

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