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)
y/6 = 2.5 // - 2.5
y/6-2.5 = 0
1/6*y-2.5 = 0 // + 2.5
1/6*y = 2.5 // : 1/6
y = 2.5/1/6
y = 14.9999997
y = 14.9999997
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