58=a-42

Solution for 58=a-42 equation:

Simplifying
58 = a + -42

Reorder the terms:
58 = -42 + a

Solving
58 = -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.
58 + -1a = -42 + a + -1a

Combine like terms: a + -1a = 0
58 + -1a = -42 + 0
58 + -1a = -42

Add '-58' to each side of the equation.
58 + -58 + -1a = -42 + -58

Combine like terms: 58 + -58 = 0
0 + -1a = -42 + -58
-1a = -42 + -58

Combine like terms: -42 + -58 = -100
-1a = -100

Divide each side by '-1'.
a = 100

Simplifying
a = 100