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(-4/15)*(x-20)*(x-35) = 0
-4/15*(x-20)*(x-35) = 0
( x-20 )
x-20 = 0 // + 20
x = 20
( x-35 )
x-35 = 0 // + 35
x = 35
x in { 20, 35 }
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