8.2-(5.1-a)=

Solution for 8.2-(5.1-a)= equation:

Simplifying
8.2 + -1(5.1 + -1a) = 0
8.2 + (5.1 * -1 + -1a * -1) = 0
8.2 + (-5.1 + 1a) = 0

Combine like terms: 8.2 + -5.1 = 3.1
3.1 + 1a = 0

Solving
3.1 + 1a = 0

Solving for variable 'a'.

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

Add '-3.1' to each side of the equation.
3.1 + -3.1 + 1a = 0 + -3.1

Combine like terms: 3.1 + -3.1 = 0.0
0.0 + 1a = 0 + -3.1
1a = 0 + -3.1

Combine like terms: 0 + -3.1 = -3.1
1a = -3.1

Divide each side by '1'.
a = -3.1

Simplifying
a = -3.1