a+3a=28

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Solution for a+3a=28 equation: 


Simplifying
a + 3a = 28

Combine like terms: a + 3a = 4a
4a = 28

Solving
4a = 28

Solving for variable 'a'.

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

Divide each side by '4'.
a = 7

Simplifying
a = 7

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