-42=y-39

Solution for -42=y-39 equation:

Simplifying
-42 = y + -39

Reorder the terms:
-42 = -39 + y

Solving
-42 = -39 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
-42 + -1y = -39 + y + -1y

Combine like terms: y + -1y = 0
-42 + -1y = -39 + 0
-42 + -1y = -39

Add '42' to each side of the equation.
-42 + 42 + -1y = -39 + 42

Combine like terms: -42 + 42 = 0
0 + -1y = -39 + 42
-1y = -39 + 42

Combine like terms: -39 + 42 = 3
-1y = 3

Divide each side by '-1'.
y = -3

Simplifying
y = -3