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x in (-oo:+oo)
((2*x)/4)*(3*x+(9*x)/7) = 0
1/2*30/7*x*x = 0
( 1/2*x )
1/2*x = 0 // : 1/2
x = 0
( 30/7*x )
30/7*x = 0 // : 30/7
x = 0
x in { 0, 0 }
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