2a-9a=21

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Solution for 2a-9a=21 equation: 


Simplifying
2a + -9a = 21

Combine like terms: 2a + -9a = -7a
-7a = 21

Solving
-7a = 21

Solving for variable 'a'.

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

Divide each side by '-7'.
a = -3

Simplifying
a = -3

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