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)
-2 = x/2 // - x/2
-(x/2)-2 = 0
-1/2*x-2 = 0 // + 2
-1/2*x = 2 // : -1/2
x = 2/(-1/2)
x = -4
x = -4
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