13=a-5.2

Solution for 13=a-5.2 equation:

Simplifying
13 = a + -5.2

Reorder the terms:
13 = -5.2 + a

Solving
13 = -5.2 + 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.
13 + -1a = -5.2 + a + -1a

Combine like terms: a + -1a = 0
13 + -1a = -5.2 + 0
13 + -1a = -5.2

Add '-13' to each side of the equation.
13 + -13 + -1a = -5.2 + -13

Combine like terms: 13 + -13 = 0
0 + -1a = -5.2 + -13
-1a = -5.2 + -13

Combine like terms: -5.2 + -13 = -18.2
-1a = -18.2

Divide each side by '-1'.
a = 18.2

Simplifying
a = 18.2