A+A+6=42

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Solution for A+A+6=42 equation: 


Simplifying
A + A + 6 = 42

Reorder the terms:
6 + A + A = 42

Combine like terms: A + A = 2A
6 + 2A = 42

Solving
6 + 2A = 42

Solving for variable 'A'.

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

Add '-6' to each side of the equation.
6 + -6 + 2A = 42 + -6

Combine like terms: 6 + -6 = 0
0 + 2A = 42 + -6
2A = 42 + -6

Combine like terms: 42 + -6 = 36
2A = 36

Divide each side by '2'.
A = 18

Simplifying
A = 18

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