3-a=-1

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Solution for 3-a=-1 equation: 


Simplifying
3 + -1a = -1

Solving
3 + -1a = -1

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 + -1a = -1 + -3

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

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

Divide each side by '-1'.
a = 4

Simplifying
a = 4

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