[tex]U = E + I\cdot R_{t}+I\cdot R_{w}\\\\U = E + I(R_{t}+R_{w})\\\\E+I(R_{t}+R_{w}) = U\\\\I(R_{t}+R_{w}) = U-E\\\\I(R_{t}+R_{w}) = U-E \ \ \ |:(R_{t}+R_{w})\\\\\\\huge\boxed{I = \frac{U-E}{R_{t}+R_{w}}}[/tex]
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[tex]U = E + I\cdot R_{t}+I\cdot R_{w}\\\\U = E + I(R_{t}+R_{w})\\\\E+I(R_{t}+R_{w}) = U\\\\I(R_{t}+R_{w}) = U-E\\\\I(R_{t}+R_{w}) = U-E \ \ \ |:(R_{t}+R_{w})\\\\\\\huge\boxed{I = \frac{U-E}{R_{t}+R_{w}}}[/tex]