If it's not what You are looking for type in the equation solver your own equation and let us solve it.
u in (-oo:+oo)
u/4.5 = -8.7 // + 8.7
u/4.5+8.7 = 0
0.22222222*u+8.7 = 0 // - 8.7
0.22222222*u = -8.7 // : 0.22222222
u = -8.7/0.22222222
u = -39.15000039
u = -39.15000039
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