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((2/3)*x+5)*(x/6-7) = 0
(2/3*x+5)*(1/6*x-7) = 0
( 1/6*x-7 )
1/6*x-7 = 0 // + 7
1/6*x = 7 // : 1/6
x = 7/1/6
x = 42
( 2/3*x+5 )
2/3*x+5 = 0 // - 5
2/3*x = -5 // : 2/3
x = -5/2/3
x = -15/2
x in { 42, -15/2 }
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