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 = 6.4615*(4/3)-8 // - 6.4615*(4/3)-8
y-(6.4615*(4/3))+8 = 0
y-8.61533333+8 = 0
y-0.61533333 = 0 // + 0.61533333
y = 0.61533333
y = 0.61533333
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