-19.0=19.9+a

Solution for -19.0=19.9+a equation:

Simplifying
-19.0 = 19.9 + a

Solving
-19.0 = 19.9 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-19.0 + -1a = 19.9 + a + -1a

Combine like terms: a + -1a = 0
-19.0 + -1a = 19.9 + 0
-19.0 + -1a = 19.9

Add '19.0' to each side of the equation.
-19.0 + 19.0 + -1a = 19.9 + 19.0

Combine like terms: -19.0 + 19.0 = 0.0
0.0 + -1a = 19.9 + 19.0
-1a = 19.9 + 19.0

Combine like terms: 19.9 + 19.0 = 38.9
-1a = 38.9

Divide each side by '-1'.
a = -38.9

Simplifying
a = -38.9