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/3+6 = -12.75 // + 12.75
y/3+6+12.75 = 0
1/3*y+18.75 = 0 // - 18.75
1/3*y = -18.75 // : 1/3
y = -18.75/1/3
y = -56.25000056
y = -56.25000056
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