8.6=2.1-1.3E

Solution for 8.6=2.1-1.3E equation:

Simplifying
8.6 = 2.1 + -1.3E

Solving
8.6 = 2.1 + -1.3E

Solving for variable 'E'.

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

Add '1.3E' to each side of the equation.
8.6 + 1.3E = 2.1 + -1.3E + 1.3E

Combine like terms: -1.3E + 1.3E = 0.0
8.6 + 1.3E = 2.1 + 0.0
8.6 + 1.3E = 2.1

Add '-8.6' to each side of the equation.
8.6 + -8.6 + 1.3E = 2.1 + -8.6

Combine like terms: 8.6 + -8.6 = 0.0
0.0 + 1.3E = 2.1 + -8.6
1.3E = 2.1 + -8.6

Combine like terms: 2.1 + -8.6 = -6.5
1.3E = -6.5

Divide each side by '1.3'.
E = -5

Simplifying
E = -5