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x in (-oo:+oo)
(-1/2)*(10*x-(18*y)) = 0
(-1/2)*(10*x-18*y) = 0
-1/2*(10*x-18*y) = 0
( -1/2 )
-1/2 = 0
x belongs to the empty set
( 10*x-18*y )
10*x-18*y = 0 // + -18*y
10*x = -(-18*y) // : 10
x = (-(-18*y))/10
x = (9*y)/5
x = (9*y)/5
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