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x in (-oo:+oo)
(-4/5)*(15*x-(15*y)) = 0
(-4/5)*(15*x-15*y) = 0
-4/5*(15*x-15*y) = 0
( -4/5 )
-4/5 = 0
x belongs to the empty set
( 15*x-15*y )
15*x-15*y = 0 // + -15*y
15*x = -(-15*y) // : 15
x = (-(-15*y))/15
x = y
x = y
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