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