2a+5a=9a

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Solution for 2a+5a=9a equation: 


Simplifying
2a + 5a = 9a

Combine like terms: 2a + 5a = 7a
7a = 9a

Solving
7a = 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
7a + -9a = 9a + -9a

Combine like terms: 7a + -9a = -2a
-2a = 9a + -9a

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

Divide each side by '-2'.
a = 0

Simplifying
a = 0

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