Calculate Unknown Resistance in Parallel Circuit

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Bryster77
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a 3.3ohm resistor and another resistor are connected in parallel across a 3v battery. the current in the circuit is 1.41 A. Find the uknown resistance

R=(1/3.3 + 1/x)^-1

V=IR
3v= 1.41A(R)
R= 2.13 ohm

this is where i got stuck...

2.13 ohm= (1/3.3 ohm + 1/x ohm)^-1

how do i go about finding x...

the answer is 6 ohm but I am curious how. :D ty