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x in (-oo:+oo)
((5/9)*x+7)*(x/5-8) = 0
(5/9*x+7)*(1/5*x-8) = 0
( 1/5*x-8 )
1/5*x-8 = 0 // + 8
1/5*x = 8 // : 1/5
x = 8/1/5
x = 40
( 5/9*x+7 )
5/9*x+7 = 0 // - 7
5/9*x = -7 // : 5/9
x = -7/5/9
x = -63/5
x in { 40, -63/5 }
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