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 = -1*(3/7)-13 // + -1*(3/7)-13
y-(-1*(3/7))+13 = 0
y+3/7+13 = 0
y+94/7 = 0 // - 94/7
y = -94/7
y = -94/7
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