(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 = 100.5
100.5 + t + 2t = 180

Combine like terms: t + 2t = 3t
100.5 + 3t = 180

Solving
100.5 + 3t = 180

Solving for variable 't'.

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

Add '-100.5' to each side of the equation.
100.5 + -100.5 + 3t = 180 + -100.5

Combine like terms: 100.5 + -100.5 = 0.0
0.0 + 3t = 180 + -100.5
3t = 180 + -100.5

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

Divide each side by '3'.
t = 26.5

Simplifying
t = 26.5