-2a-a=21

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Solution for -2a-a=21 equation: 


Simplifying
-2a + -1a = 21

Combine like terms: -2a + -1a = -3a
-3a = 21

Solving
-3a = 21

Solving for variable 'a'.

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

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

Simplifying
a = -7

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