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 = 8/2 // - 8/2
-2*x-(8/2) = 0
-2*x-4 = 0
-2*x-4 = 0 // + 4
-2*x = 4 // : -2
x = 4/(-2)
x = -2
x = -2
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