3.9=[t-0.39]

Solution for 3.9=[t-0.39] equation:

Simplifying
3.9 = [t + -0.39]

Reorder the terms:
3.9 = [-0.39 + t]

Remove brackets around [-0.39 + t]
3.9 = -0.39 + t

Solving
3.9 = -0.39 + t

Solving for variable 't'.

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

Add '-1t' to each side of the equation.
3.9 + -1t = -0.39 + t + -1t

Combine like terms: t + -1t = 0
3.9 + -1t = -0.39 + 0
3.9 + -1t = -0.39

Add '-3.9' to each side of the equation.
3.9 + -3.9 + -1t = -0.39 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + -1t = -0.39 + -3.9
-1t = -0.39 + -3.9

Combine like terms: -0.39 + -3.9 = -4.29
-1t = -4.29

Divide each side by '-1'.
t = 4.29

Simplifying
t = 4.29