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Input:
solve(P(t>x)=0.2)
Write:
`solve(P(t>x)=0.2)`
Compute:
$$solve(1-\Phi (x)=0.2)$$
Output:
$$solve(1-\Phi (x)=0.2)== 0.8416212335729144$$
Result: $$0.8416212335729144$$
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