3a-8a-4a=21

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Solution for 3a-8a-4a=21 equation: 


Simplifying
3a + -8a + -4a = 21

Combine like terms: 3a + -8a = -5a
-5a + -4a = 21

Combine like terms: -5a + -4a = -9a
-9a = 21

Solving
-9a = 21

Solving for variable 'a'.

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

Divide each side by '-9'.
a = -2.333333333

Simplifying
a = -2.333333333

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