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((5/6)*x-(15/4))*((9/2)*x+4/7) = 0
((5/6)*x-15/4)*((9/2)*x+4/7) = 0
(5/6*x-15/4)*(9/2*x+4/7) = 0
( 5/6*x-15/4 )
5/6*x-15/4 = 0 // + 15/4
5/6*x = 15/4 // : 5/6
x = 15/4/5/6
x = 9/2
( 9/2*x+4/7 )
9/2*x+4/7 = 0 // - 4/7
9/2*x = -4/7 // : 9/2
x = -4/7/9/2
x = -8/63
x in { 9/2, -8/63 }
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