3a+12a=-21

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Solution for 3a+12a=-21 equation: 


Simplifying
3a + 12a = -21

Combine like terms: 3a + 12a = 15a
15a = -21

Solving
15a = -21

Solving for variable 'a'.

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

Divide each side by '15'.
a = -1.4

Simplifying
a = -1.4

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