(9k/15+18/15)*(10k/15+20/15)

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Solution for (9k/15+18/15)*(10k/15+20/15) equation: 


k in (-oo:+oo)

((9*k)/15+18/15)*((10*k)/15+20/15) = 0

(3/5*k+6/5)*(2/3*k+4/3) = 0

( 2/3*k+4/3 )

2/3*k+4/3 = 0 // - 4/3

2/3*k = -4/3 // : 2/3

k = -4/3/2/3

k = -2

( 3/5*k+6/5 )

3/5*k+6/5 = 0 // - 6/5

3/5*k = -6/5 // : 3/5

k = -6/5/3/5

k = -2

k in { -2, -2 }

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