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Adding custom LaTeX Document Preamble package in WP LaTeX [closed]

I am using latex to render some mathematical formulas in the post(using WP LaTeX). I want to add the ‘cancel’ package to render the equation properly.

As far as I have gone through, I think I need to include/import the cancel package(usepackage{cancel}) somewhere. Is there any method to do this?

Nearest working example:

[latex size="2" color="000080"]
implies frac{10n + 12m -15n - 18m + 6m + 6n}{6} = 2
[/latex]

Failing examples (Error: Formula does not parse):

Ex. 1

[latex size="2" color="000080"]
implies frac{10n + cancel{12m} -15n - cancel{18m} + cancel{6m} + 6n}{6} = 2
[/latex]

Ex. 2

[latex size="2" color="000080"]
usepackage{cancel}
implies frac{10n + cancel{12m} -15n - cancel{18m} + cancel{6m} + 6n}{6} = 2
[/latex]

Ex. 3

[latex size="2" color="000080"]
[preamble]
usepackage{cancel}
[/preamble]
implies frac{10n + cancel{12m} -15n - cancel{18m} + cancel{6m} + 6n}{6} = 2
[/latex]

Ex. 4

[latex size="2" color="000080"]
begin{align*}
[preamble]
usepackage{cancel}
[/preamble]
implies frac{10n + cancel{12m} -15n - cancel{18m} + cancel{6m} + 6n}{6} = 2
end{align*}
[/latex]

Thanks in advance.