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(3*x+y)/4 = -y/8 // + -y/8
(3*x+y)/4-(-y/8) = 0
(3*x+y)/4+(1/8)*y = 0
(3*x+y)/4+y/8 = 0
(8*(3*x+y))/(4*8)+(4*y)/(4*8) = 0
8*(3*x+y)+4*y = 0
24*x+12*y = 0
(24*x+12*y)/(4*8) = 0
(24*x+12*y)/(4*8) = 0 // * 4*8
24*x+12*y = 0
24*x+12*y = 0 // - 12*y
24*x = -(12*y) // : 24
x = (-(12*y))/24
x = (-1/2)*y
x = (-1/2)*y
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