4.2=3a

Solution for 4.2=3a equation:

Simplifying
4.2 = 3a

Solving
4.2 = 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
4.2 + -3a = 3a + -3a

Combine like terms: 3a + -3a = 0
4.2 + -3a = 0

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -3a = 0 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -3a = 0 + -4.2
-3a = 0 + -4.2

Combine like terms: 0 + -4.2 = -4.2
-3a = -4.2

Divide each side by '-3'.
a = 1.4

Simplifying
a = 1.4