2-1a=3

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Solution for 2-1a=3 equation: 


Simplifying
2 + -1a = 3

Solving
2 + -1a = 3

Solving for variable 'a'.

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

Add '-2' to each side of the equation.
2 + -2 + -1a = 3 + -2

Combine like terms: 2 + -2 = 0
0 + -1a = 3 + -2
-1a = 3 + -2

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

Divide each side by '-1'.
a = -1

Simplifying
a = -1

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