If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r in (-oo:+oo)
r/2.6-4.3 = 9.1 // - 9.1
r/2.6-9.1-4.3 = 0
0.38461538*r-13.4 = 0 // + 13.4
0.38461538*r = 13.4 // : 0.38461538
r = 13.4/0.38461538
r = 34.84000042
r = 34.84000042
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