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