4.2=a+6.4+1.1

Solution for 4.2=a+6.4+1.1 equation:

Simplifying
4.2 = a + 6.4 + 1.1

Reorder the terms:
4.2 = 6.4 + 1.1 + a

Combine like terms: 6.4 + 1.1 = 7.5
4.2 = 7.5 + a

Solving
4.2 = 7.5 + 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.
4.2 + -1a = 7.5 + a + -1a

Combine like terms: a + -1a = 0
4.2 + -1a = 7.5 + 0
4.2 + -1a = 7.5

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -1a = 7.5 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -1a = 7.5 + -4.2
-1a = 7.5 + -4.2

Combine like terms: 7.5 + -4.2 = 3.3
-1a = 3.3

Divide each side by '-1'.
a = -3.3

Simplifying
a = -3.3