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(-3/4)*(20*x-(8*y)) = 0
(-3/4)*(20*x-8*y) = 0
-3/4*(20*x-8*y) = 0
( -3/4 )
-3/4 = 0
x belongs to the empty set
( 20*x-8*y )
20*x-8*y = 0 // + -8*y
20*x = -(-8*y) // : 20
x = (-(-8*y))/20
x = (2*y)/5
x = (2*y)/5
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