Can someone solve x - 8 = -3x + 12

and x + 12 = -x - 6

STEP BY STEP PLEASE? !

Adoctor administers a drug to a 38-kg patient, using a dosage formula of 50 mg/kg/day. assume that the drug is available in a 100 mg per 5 ml suspension or in 500 mg tablets. a. how many tablets should a 38-kg patient take every four hours? b. the suspension with a drop factor of 10 ggt/ml delivers the drug intravenously to the patient over a twelve-hour period. what flow rate should be used in units of ggt/hr? a. the patient should take nothing pills every four hours. (type an integer or decimal rounded to the nearest hundredth as needed.)

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

What is the value for this expression? 2e-5