42=t-31

Solution for 42=t-31 equation:

Simplifying
42 = t + -31

Reorder the terms:
42 = -31 + t

Solving
42 = -31 + t

Solving for variable 't'.

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

Add '-1t' to each side of the equation.
42 + -1t = -31 + t + -1t

Combine like terms: t + -1t = 0
42 + -1t = -31 + 0
42 + -1t = -31

Add '-42' to each side of the equation.
42 + -42 + -1t = -31 + -42

Combine like terms: 42 + -42 = 0
0 + -1t = -31 + -42
-1t = -31 + -42

Combine like terms: -31 + -42 = -73
-1t = -73

Divide each side by '-1'.
t = 73

Simplifying
t = 73