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