A concession can remain true
An expensive solution can still save time. A concessive structure does not require denying its first proposition. When zwar opens the main clause, put the finite verb next; with obwohl, use a subordinate clause and final verb.
Zwar ist die Lösung teuer, aber sie spart Zeit.
The solution is admittedly expensive, but it saves time.
Compare the same criteria and keep referents clear
Parallel structure helps the reader compare cost with cost or time with time. A pronoun can shorten the argument only when its referent is recoverable. Repeat a noun if several possible referents would make the intended link uncertain.
Einerseits spart der Plan Geld, andererseits kostet er Zeit.
On the one hand the plan saves money; on the other it costs time.
Limit the conclusion to what the evidence shows
An exact count of three positive replies out of five supports not all, but not none. A plausible explanation need not be the only explanation. Distinguish the observation, the inference and any recommendation rather than hiding that difference behind a connector.
Drei von fünf stimmen zu. Nicht alle sind einverstanden.
Three of five agree. Not everyone agrees.
Practise this pattern
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References
Original explanations and examples informed by grammar references. Level placement is an editorial teaching choice.