7.4-4.2=5.7a-4.7a-9.2

Solution for 7.4-4.2=5.7a-4.7a-9.2 equation:

Simplifying
7.4 + -4.2 = 5.7a + -4.7a + -9.2

Combine like terms: 7.4 + -4.2 = 3.2
3.2 = 5.7a + -4.7a + -9.2

Reorder the terms:
3.2 = -9.2 + 5.7a + -4.7a

Combine like terms: 5.7a + -4.7a = 1a
3.2 = -9.2 + 1a

Solving
3.2 = -9.2 + 1a

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.
3.2 + -1a = -9.2 + 1a + -1a

Combine like terms: 1a + -1a = 0
3.2 + -1a = -9.2 + 0
3.2 + -1a = -9.2

Add '-3.2' to each side of the equation.
3.2 + -3.2 + -1a = -9.2 + -3.2

Combine like terms: 3.2 + -3.2 = 0.0
0.0 + -1a = -9.2 + -3.2
-1a = -9.2 + -3.2

Combine like terms: -9.2 + -3.2 = -12.4
-1a = -12.4

Divide each side by '-1'.
a = 12.4

Simplifying
a = 12.4