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/5+3.4 = -9.1 // + 9.1
u/5+3.4+9.1 = 0
1/5*u+12.5 = 0 // - 12.5
1/5*u = -12.5 // : 1/5
u = -12.5/1/5
u = -62.5
u = -62.5
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