If it's not what You are looking for type in the equation solver your own equation and let us solve it.
h in (-oo:+oo)
h/3 = 2.85 // - 2.85
h/3-2.85 = 0
1/3*h-2.85 = 0 // + 2.85
1/3*h = 2.85 // : 1/3
h = 2.85/1/3
h = 8.55000009
h = 8.55000009
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