a-1=3n

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Solution for a-1=3n equation: 


Simplifying
a + -1 = 3n

Reorder the terms:
-1 + a = 3n

Solving
-1 + a = 3n

Solving for variable 'a'.

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

Add '1' to each side of the equation.
-1 + 1 + a = 1 + 3n

Combine like terms: -1 + 1 = 0
0 + a = 1 + 3n
a = 1 + 3n

Simplifying
a = 1 + 3n

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