2a+7a=12+6a

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Solution for 2a+7a=12+6a equation: 


Simplifying
2a + 7a = 12 + 6a

Combine like terms: 2a + 7a = 9a
9a = 12 + 6a

Solving
9a = 12 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
9a + -6a = 12 + 6a + -6a

Combine like terms: 9a + -6a = 3a
3a = 12 + 6a + -6a

Combine like terms: 6a + -6a = 0
3a = 12 + 0
3a = 12

Divide each side by '3'.
a = 4

Simplifying
a = 4

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