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enter image description here Suppose I want to calculate the tension/compression force only in 4.

Is there an easier way to calculate it or do I have to calculate everything with the joint method?

I don't immediately see zero-force members.

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Just consider the balance of a small section of the truss.

skt

You have 3 unknown forces (three member tensions, shown in red) and 3 equations (sum of forces & moments are zero). The reaction forces (shown in blue) are considered known for a statically determinant problem.

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