a+r=z

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Solution for a+r=z equation: 


Simplifying
a + r = z

Solving
a + r = z

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 = -1r + z

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

Simplifying
a = -1r + z

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