12.1-a=8

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Solution for 12.1-a=8 equation: 


Simplifying
12.1 + -1a = 8

Solving
12.1 + -1a = 8

Solving for variable 'a'.

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

Add '-12.1' to each side of the equation.
12.1 + -12.1 + -1a = 8 + -12.1

Combine like terms: 12.1 + -12.1 = 0.0
0.0 + -1a = 8 + -12.1
-1a = 8 + -12.1

Combine like terms: 8 + -12.1 = -4.1
-1a = -4.1

Divide each side by '-1'.
a = 4.1

Simplifying
a = 4.1

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