42=3a+3a

Solution for 42=3a+3a equation:

Simplifying
42 = 3a + 3a

Combine like terms: 3a + 3a = 6a
42 = 6a

Solving
42 = 6a

Solving for variable 'a'.

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

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

Combine like terms: 6a + -6a = 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