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(-2/5)*(5*x-(20*y)) = 0
(-2/5)*(5*x-20*y) = 0
-2/5*(5*x-20*y) = 0
5*x-20*y = 0 // + -20*y
5*x = -(-20*y) // : 5
x = (-(-20*y))/5
x = 4*y
x = 4*y
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