`x + 2x + 12x = 81`

Combine like terms.

`15x = 81`

Divide both sides by 15.

`(15x)/15 = 81/15`

` ` `x = 81/15`

Reduce your answer by factor of 3.

`x = 27/5` or `x = 5.4` `lArr`** The solution**

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