(t-10.5)+2t+90=180

Solution for (t-10.5)+2t+90=180 equation:

Simplifying
(t + -10.5) + 2t + 90 = 180

Reorder the terms:
(-10.5 + t) + 2t + 90 = 180

Remove parenthesis around (-10.5 + t)
-10.5 + t + 2t + 90 = 180

Reorder the terms:
-10.5 + 90 + t + 2t = 180

Combine like terms: -10.5 + 90 = 79.5
79.5 + t + 2t = 180

Combine like terms: t + 2t = 3t
79.5 + 3t = 180

Solving
79.5 + 3t = 180

Solving for variable 't'.

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

Add '-79.5' to each side of the equation.
79.5 + -79.5 + 3t = 180 + -79.5

Combine like terms: 79.5 + -79.5 = 0.0
0.0 + 3t = 180 + -79.5
3t = 180 + -79.5

Combine like terms: 180 + -79.5 = 100.5
3t = 100.5

Divide each side by '3'.
t = 33.5

Simplifying
t = 33.5