(1/5+8c)(1/21-9c)=0

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Solution for (1/5+8c)(1/21-9c)=0 equation: 


c in (-oo:+oo)

(8*c+1/5)*(1/21-(9*c)) = 0

(8*c+1/5)*(1/21-9*c) = 0

( 1/21-9*c )

1/21-9*c = 0 // - 1/21

-9*c = -1/21 // : -9

c = -1/21/(-9)

c = 1/189

( 8*c+1/5 )

8*c+1/5 = 0 // - 1/5

8*c = -1/5 // : 8

c = -1/5/8

c = -1/40

c in { 1/189, -1/40 }

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