-7.8+8.1=x

Solution for -7.8+8.1=x equation:

Simplifying
-7.8 + 8.1 = x

Combine like terms: -7.8 + 8.1 = 0.3
0.3 = x

Solving
0.3 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
0.3 + -1x = x + -1x

Combine like terms: x + -1x = 0
0.3 + -1x = 0

Add '-0.3' to each side of the equation.
0.3 + -0.3 + -1x = 0 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
0.0 + -1x = 0 + -0.3
-1x = 0 + -0.3

Combine like terms: 0 + -0.3 = -0.3
-1x = -0.3

Divide each side by '-1'.
x = 0.3

Simplifying
x = 0.3