Periodic tune-ups are important because they

Periodic tune ups and transmission overhauling according to company’s specifications lengthen the life of the vehicle, avoid the need for expensive maintenances, and avoid unsafe failures. For the duration of a tune-up, you must have your spark plugs, spark provider, distributor cap, and air filter new. The effectiveness of your vehicle should be checked and attuned, and your points should be changed, if your vehicle has them. The law necessitates in furthermost cases that you have an emission test every two years, at the time of record-keeping or at time of sale. It is a respectable awareness to have the smog control constituents checked at the time of a tune-up. Make certain that smog controller devices are together and linked appropriately.

Ithink the answer may be -7 by when dividing both sides by -3