a+a+9=51

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Solution for a+a+9=51 equation: 


Simplifying
a + a + 9 = 51

Reorder the terms:
9 + a + a = 51

Combine like terms: a + a = 2a
9 + 2a = 51

Solving
9 + 2a = 51

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + 2a = 51 + -9

Combine like terms: 9 + -9 = 0
0 + 2a = 51 + -9
2a = 51 + -9

Combine like terms: 51 + -9 = 42
2a = 42

Divide each side by '2'.
a = 21

Simplifying
a = 21

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