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