50=a-42

Solution for 50=a-42 equation:

Simplifying
50 = a + -42

Reorder the terms:
50 = -42 + a

Solving
50 = -42 + 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.
50 + -1a = -42 + a + -1a

Combine like terms: a + -1a = 0
50 + -1a = -42 + 0
50 + -1a = -42

Add '-50' to each side of the equation.
50 + -50 + -1a = -42 + -50

Combine like terms: 50 + -50 = 0
0 + -1a = -42 + -50
-1a = -42 + -50

Combine like terms: -42 + -50 = -92
-1a = -92

Divide each side by '-1'.
a = 92

Simplifying
a = 92