2r+a=n

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Solution for 2r+a=n equation: 


Simplifying
2r + a = n

Reorder the terms:
a + 2r = n

Solving
a + 2r = n

Solving for variable 'a'.

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

Add '-2r' to each side of the equation.
a + 2r + -2r = n + -2r

Combine like terms: 2r + -2r = 0
a + 0 = n + -2r
a = n + -2r

Simplifying
a = n + -2r

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