(5x+4)*(x-4)/5

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Solution for (5x+4)*(x-4)/5 equation: 


x in (-oo:+oo)

((5*x+4)*(x-4))/5 = 0

( 5*x+4 )

5*x+4 = 0 // - 4

5*x = -4 // : 5

x = -4/5

( x-4 )

x-4 = 0 // + 4

x = 4

x in { -4/5, 4 }

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