3a+a=21

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Solution for 3a+a=21 equation: 


Simplifying
3a + a = 21

Combine like terms: 3a + a = 4a
4a = 21

Solving
4a = 21

Solving for variable 'a'.

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

Divide each side by '4'.
a = 5.25

Simplifying
a = 5.25

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