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I created five circuits with same resistances, voltage source, and current source. On left circuit, it show full two sources circuit. Also, you can see other two circuits that has single source separately.
Resistances are in series, sum it up only.
Resistances are in parallel, use inverse to sum it up and then use inverse again, like that (for center circuit, (7^-1+13^-1)^-1 )
You can see finalize of new resistance on two circuits bottom with ohmmeter. Also, you can see final voltage drop on two sources circuit, so there are two voltage drop on other circuits.
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