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