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 = -13/3.14159 // + -13/3.14159
y-(-13/3.14159) = 0
y+4.13803202 = 0
y+4.13803202 = 0 // - 4.13803202
y = -4.13803202
y = -4.13803202
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