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(2/5)*(10*x-15) = 0
2/5*(10*x-15) = 0
( 10*x-15 )
10*x-15 = 0 // + 15
10*x = 15 // : 10
x = 15/10
x = 3/2
( 2/5 )
2/5 = 0
x belongs to the empty set
x = 3/2
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