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((x-100)/9)*(5*x-50) = 0
((x-100)*(5*x-50))/9 = 0
( 5*x-50 )
5*x-50 = 0 // + 50
5*x = 50 // : 5
x = 50/5
x = 10
( x-100 )
x-100 = 0 // + 100
x = 100
x in { 10, 100 }
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