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(-1/2)*(20*x-(6*y)) = 0
(-1/2)*(20*x-6*y) = 0
-1/2*(20*x-6*y) = 0
20*x-6*y = 0 // + -6*y
20*x = -(-6*y) // : 20
x = (-(-6*y))/20
x = (3*y)/10
x = (3*y)/10
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