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5*((5*x)/3)*(x-7) = 0
25/3*x*(x-7) = 0
( 25/3*x )
25/3*x = 0 // : 25/3
x = 0
( x-7 )
x-7 = 0 // + 7
x = 7
x in { 0, 7 }
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