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(x-(2/3))*(5*x+4) = 0
(x-2/3)*(5*x+4) = 0
( 5*x+4 )
5*x+4 = 0 // - 4
5*x = -4 // : 5
x = -4/5
( x-2/3 )
x-2/3 = 0 // + 2/3
x = 2/3
x in { -4/5, 2/3 }
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