Find out polarity and value of voltages by use Kirchhoff law

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The voltages demonstrated in the circuit of figure in below have no assigned directions demonstrated but have the magnitudes as given here:

V₁ = 3V, V₂ = 4.5V, V₃ = 7V, V₄ = 2.5V and E₁ = 6V, E₂ = 20V, E₃ = 2E₄.

By applying Kirchhoff's Voltage Law to the circuit, find out the polarity and value of the voltages E₃ and E₄.

331_polarity and value of the voltages.png

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