2.1=a+5.2

Solution for 2.1=a+5.2 equation:

Simplifying
2.1 = a + 5.2

Reorder the terms:
2.1 = 5.2 + a

Solving
2.1 = 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.
2.1 + -1a = 5.2 + a + -1a

Combine like terms: a + -1a = 0
2.1 + -1a = 5.2 + 0
2.1 + -1a = 5.2

Add '-2.1' to each side of the equation.
2.1 + -2.1 + -1a = 5.2 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + -1a = 5.2 + -2.1
-1a = 5.2 + -2.1

Combine like terms: 5.2 + -2.1 = 3.1
-1a = 3.1

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

Simplifying
a = -3.1