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

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

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

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

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

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

Combine like terms: 90 + 10.5 = 100.5
100.5 + 2t + t = 180

Combine like terms: 2t + t = 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