4a=21+1a

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Solution for 4a=21+1a equation: 


Simplifying
4a = 21 + 1a

Solving
4a = 21 + 1a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
4a + -1a = 21 + 1a + -1a

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

Combine like terms: 1a + -1a = 0
3a = 21 + 0
3a = 21

Divide each side by '3'.
a = 7

Simplifying
a = 7

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