2(t+5)+13=21

Solution for 2(t+5)+13=21 equation:

Simplifying
2(t + 5) + 13 = 21

Reorder the terms:
2(5 + t) + 13 = 21
(5 * 2 + t * 2) + 13 = 21
(10 + 2t) + 13 = 21

Reorder the terms:
10 + 13 + 2t = 21

Combine like terms: 10 + 13 = 23
23 + 2t = 21

Solving
23 + 2t = 21

Solving for variable 't'.

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

Add '-23' to each side of the equation.
23 + -23 + 2t = 21 + -23

Combine like terms: 23 + -23 = 0
0 + 2t = 21 + -23
2t = 21 + -23

Combine like terms: 21 + -23 = -2
2t = -2

Divide each side by '2'.
t = -1

Simplifying
t = -1