-42=7a

Solution for -42=7a equation:

Simplifying
-42 = 7a

Solving
-42 = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
-42 + -7a = 7a + -7a

Combine like terms: 7a + -7a = 0
-42 + -7a = 0

Add '42' to each side of the equation.
-42 + 42 + -7a = 0 + 42

Combine like terms: -42 + 42 = 0
0 + -7a = 0 + 42
-7a = 0 + 42

Combine like terms: 0 + 42 = 42
-7a = 42

Divide each side by '-7'.
a = -6

Simplifying
a = -6