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