4a-3a+2a=21

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Solution for 4a-3a+2a=21 equation: 


Simplifying
4a + -3a + 2a = 21

Combine like terms: 4a + -3a = 1a
1a + 2a = 21

Combine like terms: 1a + 2a = 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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