r-a=w

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Solution for r-a=w equation: 


Simplifying
r + -1a = w

Reorder the terms:
-1a + r = w

Solving
-1a + r = w

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.
-1a + r + -1r = -1r + w

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

Divide each side by '-1'.
a = r + -1w

Simplifying
a = r + -1w

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