3(c+0.4)=3.9

Solution for 3(c+0.4)=3.9 equation:

Simplifying
3(c + 0.4) = 3.9

Reorder the terms:
3(0.4 + c) = 3.9
(0.4 * 3 + c * 3) = 3.9
(1.2 + 3c) = 3.9

Solving
1.2 + 3c = 3.9

Solving for variable 'c'.

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

Add '-1.2' to each side of the equation.
1.2 + -1.2 + 3c = 3.9 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
0.0 + 3c = 3.9 + -1.2
3c = 3.9 + -1.2

Combine like terms: 3.9 + -1.2 = 2.7
3c = 2.7

Divide each side by '3'.
c = 0.9

Simplifying
c = 0.9