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(-1/3)*(12*x-(3*y)) = 0
(-1/3)*(12*x-3*y) = 0
-1/3*(12*x-3*y) = 0
12*x-3*y = 0 // + -3*y
12*x = -(-3*y) // : 12
x = (-(-3*y))/12
x = y/4
x = y/4
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