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)
-0.89 = x/2 // - x/2
-(x/2)-0.89 = 0
-1/2*x-0.89 = 0 // + 0.89
-1/2*x = 0.89 // : -1/2
x = 0.89/(-1/2)
x = -1.78
x = -1.78
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