7a-42=a

Solution for 7a-42=a equation:

Simplifying
7a + -42 = a

Reorder the terms:
-42 + 7a = a

Solving
-42 + 7a = 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.
-42 + 7a + -1a = a + -1a

Combine like terms: 7a + -1a = 6a
-42 + 6a = a + -1a

Combine like terms: a + -1a = 0
-42 + 6a = 0

Add '42' to each side of the equation.
-42 + 42 + 6a = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 6a = 0 + 42
6a = 0 + 42

Combine like terms: 0 + 42 = 42
6a = 42

Divide each side by '6'.
a = 7

Simplifying
a = 7