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(2/3)*x*(-3*x-6) = 0
2/3*x*(-3*x-6) = 0
( -3*x-6 )
-3*x-6 = 0 // + 6
-3*x = 6 // : -3
x = 6/(-3)
x = -2
( 2/3*x )
2/3*x = 0 // : 2/3
x = 0
x in { -2, 0 }
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