2a+5a=21

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Solution for 2a+5a=21 equation: 


Simplifying
2a + 5a = 21

Combine like terms: 2a + 5a = 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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