If it's not what You are looking for type in the equation solver your own equation and let us solve it.
v in (-oo:+oo)
v/2-2.2 = -27.8 // + 27.8
v/2-2.2+27.8 = 0
1/2*v+25.6 = 0 // - 25.6
1/2*v = -25.6 // : 1/2
v = -25.6/1/2
v = -51.2
v = -51.2
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