0.2(15-3t)-1.8=0

Solution for 0.2(15-3t)-1.8=0 equation:

Simplifying
0.2(15 + -3t) + -1.8 = 0
(15 * 0.2 + -3t * 0.2) + -1.8 = 0
(3 + -0.6t) + -1.8 = 0

Reorder the terms:
3 + -1.8 + -0.6t = 0

Combine like terms: 3 + -1.8 = 1.2
1.2 + -0.6t = 0

Solving
1.2 + -0.6t = 0

Solving for variable 't'.

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

Add '-1.2' to each side of the equation.
1.2 + -1.2 + -0.6t = 0 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
0.0 + -0.6t = 0 + -1.2
-0.6t = 0 + -1.2

Combine like terms: 0 + -1.2 = -1.2
-0.6t = -1.2

Divide each side by '-0.6'.
t = 2

Simplifying
t = 2