(5x-21)/7x=0

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Solution for (5x-21)/7x=0 equation: 


x in (-oo:+oo)

x*((5*x-21)/7) = 0

(x*(5*x-21))/7 = 0

( 5*x-21 )

5*x-21 = 0 // + 21

5*x = 21 // : 5

x = 21/5

( x )

x = 0

x in { 21/5, 0 }

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