E=(R+r)I

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Solution for E=(R+r)I equation: 


Simplifying
E = (R + r) * I

Reorder the terms for easier multiplication:
E = I(R + r)
E = (R * I + r * I)
E = (IR + rI)

Solving
E = IR + rI

Solving for variable 'E'.

Move all terms containing E to the left, all other terms to the right.

Simplifying
E = IR + rI

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