If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y = -x-(y/2) // + -x-(y/2)
x+y+y/2 = 0
x+3/2*y = 0 // - 3/2*y
x = -(3/2*y)
x = -3/2*y
x = -3/2*y
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