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(1/2)*x-((2/3)*y)+1/4 = 0
(1/2)*x+(-2/3)*y+1/4 = 0
1/2*x-2/3*y+1/4 = 0 // - 1/4-2/3*y
1/2*x = -(1/4-2/3*y) // : 1/2
x = (-(1/4-2/3*y))/1/2
x = -2*(1/4-2/3*y)
x = -2*(1/4-2/3*y)
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