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x in (-oo:+oo)
(-3/4)*(5*x-y) = 0
-3/4*(5*x-y) = 0
( -3/4 )
-3/4 = 0
x belongs to the empty set
( 5*x-y )
5*x-y = 0 // + y
5*x = y // : 5
x = y/5
x = y/5
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