3a-a=9-1

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Solution for 3a-a=9-1 equation: 


Simplifying
3a + -1a = 9 + -1

Combine like terms: 3a + -1a = 2a
2a = 9 + -1

Combine like terms: 9 + -1 = 8
2a = 8

Solving
2a = 8

Solving for variable 'a'.

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

Divide each side by '2'.
a = 4

Simplifying
a = 4

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