If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
(1/3)*f+13 = 16.2 // - 16.2
(1/3)*f-16.2+13 = 0
1/3*f-3.2 = 0 // + 3.2
1/3*f = 3.2 // : 1/3
f = 3.2/1/3
f = 9.6000001
f = 9.6000001
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