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(-4/5)*(20*x-(20*y)) = 0
(-4/5)*(20*x-20*y) = 0
-4/5*(20*x-20*y) = 0
20*x-20*y = 0 // + -20*y
20*x = -(-20*y) // : 20
x = (-(-20*y))/20
x = y
x = y
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