12a+3a=60

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Solution for 12a+3a=60 equation: 


Simplifying
12a + 3a = 60

Combine like terms: 12a + 3a = 15a
15a = 60

Solving
15a = 60

Solving for variable 'a'.

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

Divide each side by '15'.
a = 4

Simplifying
a = 4

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