4x - 5y = 1 Subtract 4x from both sides
4x - 4x - 5y = 1 - 4x
- 5t = 1 - 4x Or more conventionally
-5x = -4x + 1 Divide by - 5
y = -4x/-5 + 1/-5
y = (4/5) x - 1/5
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