3x+a=9

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Solution for 3x+a=9 equation: 


Simplifying
3x + a = 9

Reorder the terms:
a + 3x = 9

Solving
a + 3x = 9

Solving for variable 'a'.

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

Add '-3x' to each side of the equation.
a + 3x + -3x = 9 + -3x

Combine like terms: 3x + -3x = 0
a + 0 = 9 + -3x
a = 9 + -3x

Simplifying
a = 9 + -3x

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