12-13+t-15=42

Solution for 12-13+t-15=42 equation:

Simplifying
12 + -13 + t + -15 = 42

Reorder the terms:
12 + -13 + -15 + t = 42

Combine like terms: 12 + -13 = -1
-1 + -15 + t = 42

Combine like terms: -1 + -15 = -16
-16 + t = 42

Solving
-16 + t = 42

Solving for variable 't'.

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

Add '16' to each side of the equation.
-16 + 16 + t = 42 + 16

Combine like terms: -16 + 16 = 0
0 + t = 42 + 16
t = 42 + 16

Combine like terms: 42 + 16 = 58
t = 58

Simplifying
t = 58