(5/7y-3)(5/7y+3)

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Solution for (5/7y-3)(5/7y+3) equation: 


y in (-oo:+oo)

((5/7)*y-3)*((5/7)*y+3) = 0

(5/7*y-3)*(5/7*y+3) = 0

( 5/7*y+3 )

5/7*y+3 = 0 // - 3

5/7*y = -3 // : 5/7

y = -3/5/7

y = -21/5

( 5/7*y-3 )

5/7*y-3 = 0 // + 3

5/7*y = 3 // : 5/7

y = 3/5/7

y = 21/5

y in { -21/5, 21/5 }

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