-42=a-42

Solution for -42=a-42 equation:

Simplifying
-42 = a + -42

Reorder the terms:
-42 = -42 + a

Add '42' to each side of the equation.
-42 + 42 = -42 + 42 + a

Combine like terms: -42 + 42 = 0
0 = -42 + 42 + a

Combine like terms: -42 + 42 = 0
0 = 0 + a
0 = a

Solving
0 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
0 + -1a = a + -1a
Remove the zero:
-1a = a + -1a

Combine like terms: a + -1a = 0
-1a = 0

Divide each side by '-1'.
a = 0

Simplifying
a = 0