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__<__σ] in terms of the Q function?

I know that P[|X-μ]

__<__σ] can be decomposed into P[X

__>__-σ + μ] + P[X

__<__σ + μ] i'm not sure what to do next. i know P[X

__<__σ + μ] can be expressed as 1 - phi(σ + μ - μ / σ) = Q(1), but i'm not sure how to approach P[X

__>__-σ + μ]. I know the answer is 1 - 2Q(1)...not sure where this all comes from