If I weren't busy ... is formally correct, but many people these days, especially speakers of BrE use If I wasn't ... Few would think of it as incorrect.
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blasterand this is a screenshoot for an examen who I had on a websitehttp://prntscr.com/5j02yh that's correct ?The screenshot's two options are both correct. Note that they are not the same as the sentences in your post.