60=42+a

Solution for 60=42+a equation:

Simplifying
60 = 42 + a

Solving
60 = 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.
60 + -1a = 42 + a + -1a

Combine like terms: a + -1a = 0
60 + -1a = 42 + 0
60 + -1a = 42

Add '-60' to each side of the equation.
60 + -60 + -1a = 42 + -60

Combine like terms: 60 + -60 = 0
0 + -1a = 42 + -60
-1a = 42 + -60

Combine like terms: 42 + -60 = -18
-1a = -18

Divide each side by '-1'.
a = 18

Simplifying
a = 18