If it's not what You are looking for type in the equation solver your own equation and let us solve it.
m in (-oo:+oo)
m/2.6 = 3.5 // - 3.5
m/2.6-3.5 = 0
0.38461538*m-3.5 = 0 // + 3.5
0.38461538*m = 3.5 // : 0.38461538
m = 3.5/0.38461538
m = 9.10000011
m = 9.10000011
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