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