a-3=r

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Solution for a-3=r equation: 


Simplifying
a + -3 = r

Reorder the terms:
-3 + a = r

Solving
-3 + a = r

Solving for variable 'a'.

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

Add '3' to each side of the equation.
-3 + 3 + a = 3 + r

Combine like terms: -3 + 3 = 0
0 + a = 3 + r
a = 3 + r

Simplifying
a = 3 + r

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