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x in (-oo:+oo)
(-6/2)*(6*x-(20*y)) = 0
(-6/2)*(6*x-20*y) = 0
-3*(6*x-20*y) = 0
( -3 )
-3 = 0
x belongs to the empty set
( 6*x-20*y )
6*x-20*y = 0 // + -20*y
6*x = -(-20*y) // : 6
x = (-(-20*y))/6
x = (10*y)/3
x = (10*y)/3
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