t+t+12=42

Solution for t+t+12=42 equation:

Simplifying
t + t + 12 = 42

Reorder the terms:
12 + t + t = 42

Combine like terms: t + t = 2t
12 + 2t = 42

Solving
12 + 2t = 42

Solving for variable 't'.

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

Add '-12' to each side of the equation.
12 + -12 + 2t = 42 + -12

Combine like terms: 12 + -12 = 0
0 + 2t = 42 + -12
2t = 42 + -12

Combine like terms: 42 + -12 = 30
2t = 30

Divide each side by '2'.
t = 15

Simplifying
t = 15