If it's not what You are looking for type in the equation solver your own equation and let us solve it.
y in (-oo:+oo)
-4 = y/2 // - y/2
-(y/2)-4 = 0
-1/2*y-4 = 0 // + 4
-1/2*y = 4 // : -1/2
y = 4/(-1/2)
y = -8
y = -8
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