If it's not what You are looking for type in the equation solver your own equation and let us solve it.
y in (-oo:+oo)
(2*y)/3 = 3.9 // - 3.9
(2*y)/3-3.9 = 0
2/3*y-3.9 = 0 // + 3.9
2/3*y = 3.9 // : 2/3
y = 3.9/2/3
y = 5.84999997
y = 5.84999997
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