39=9-2a

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Solution for 39=9-2a equation:


Simplifying
39 = 9 + -2a

Solving
39 = 9 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
39 + 2a = 9 + -2a + 2a

Combine like terms: -2a + 2a = 0
39 + 2a = 9 + 0
39 + 2a = 9

Add '-39' to each side of the equation.
39 + -39 + 2a = 9 + -39

Combine like terms: 39 + -39 = 0
0 + 2a = 9 + -39
2a = 9 + -39

Combine like terms: 9 + -39 = -30
2a = -30

Divide each side by '2'.
a = -15

Simplifying
a = -15

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