a-1=2+1

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Solution for a-1=2+1 equation: 


Simplifying
a + -1 = 2 + 1

Reorder the terms:
-1 + a = 2 + 1

Combine like terms: 2 + 1 = 3
-1 + a = 3

Solving
-1 + a = 3

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 = 3 + 1

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

Combine like terms: 3 + 1 = 4
a = 4

Simplifying
a = 4

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