a+r=k

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Solution for a+r=k equation: 


Simplifying
a + r = k

Solving
a + r = k

Solving for variable 'a'.

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

Add '-1r' to each side of the equation.
a + r + -1r = k + -1r

Combine like terms: r + -1r = 0
a + 0 = k + -1r
a = k + -1r

Simplifying
a = k + -1r

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