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 = 7/9.1-7 // - 7/9.1-7
y-(7/9.1)+7 = 0
y-0.76923077+7 = 0
y+6.23076923 = 0 // - 6.23076923
y = -6.23076923
y = -6.23076923
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