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(4/5)*((3*x)/2-5)*(10*x-2) = 0
4/5*(3/2*x-5)*(10*x-2) = 0
( 10*x-2 )
10*x-2 = 0 // + 2
10*x = 2 // : 10
x = 2/10
x = 1/5
( 3/2*x-5 )
3/2*x-5 = 0 // + 5
3/2*x = 5 // : 3/2
x = 5/3/2
x = 10/3
( 4/5 )
4/5 = 0
x belongs to the empty set
x in { 1/5, 10/3 }
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