a-3a=12-6

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Solution for a-3a=12-6 equation: 


Simplifying
a + -3a = 12 + -6

Combine like terms: a + -3a = -2a
-2a = 12 + -6

Combine like terms: 12 + -6 = 6
-2a = 6

Solving
-2a = 6

Solving for variable 'a'.

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

Divide each side by '-2'.
a = -3

Simplifying
a = -3

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