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/3 = 2.9 // - 2.9
r/3-2.9 = 0
1/3*r-2.9 = 0 // + 2.9
1/3*r = 2.9 // : 1/3
r = 2.9/1/3
r = 8.70000009
r = 8.70000009
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