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