e+r=s

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Solution for e+r=s equation: 


Simplifying
e + r = s

Solving
e + r = s

Solving for variable 'e'.

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

Add '-1r' to each side of the equation.
e + r + -1r = -1r + s

Combine like terms: r + -1r = 0
e + 0 = -1r + s
e = -1r + s

Simplifying
e = -1r + s

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