The standard form of a line is in the form `Ax + By = C` where `A` is a positive integer, and `B` , and `C` are integers.
First we need to get rid of brackets.
`y-3=3x+18`
Now we put `x` and `y` variables on the left side and numbers to the right side.
`-3x+y=3+18`
`-3x+y=21`
Now we multiply the whole equation by `-1` because we want parameter `A` to be positive.
`3x-y=-21` <-- Standard form
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