3a+5a=12

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Solution for 3a+5a=12 equation: 


Simplifying
3a + 5a = 12

Combine like terms: 3a + 5a = 8a
8a = 12

Solving
8a = 12

Solving for variable 'a'.

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

Divide each side by '8'.
a = 1.5

Simplifying
a = 1.5

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