Just work on each part independently, keeping the OR as is
3x−91>−87 OR 21x−17>25
3x > 4 OR 21x > 42
x > 4/3 OR x > 2
since the x > 2 is covered by the x > 4/3 and we have the UNION of the two relations
x > 4/3
3x−91>−87 OR 21x−17>25
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