(5/7t-5)(1/5t-21)

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Solution for (5/7t-5)(1/5t-21) equation: 


t in (-oo:+oo)

((5/7)*t-5)*((1/5)*t-21) = 0

(5/7*t-5)*(1/5*t-21) = 0

( 1/5*t-21 )

1/5*t-21 = 0 // + 21

1/5*t = 21 // : 1/5

t = 21/1/5

t = 105

( 5/7*t-5 )

5/7*t-5 = 0 // + 5

5/7*t = 5 // : 5/7

t = 5/5/7

t = 7

t in { 105, 7 }

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