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