-6a-a=-21

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Solution for -6a-a=-21 equation: 


Simplifying
-6a + -1a = -21

Combine like terms: -6a + -1a = -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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