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Solve the system of equations using the addition method.
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Nicotine
A potent chemical found in tobacco plants that acts as a stimulant and is highly addictive, commonly consumed through smoking cigarettes.
Cocaine
A powerful stimulant drug derived from the leaves of the coca plant, which can cause intense high and is highly addictive.
Amphetamines
A class of potent stimulant drugs that affect the central nervous system, enhancing alertness and energy.
Appetite
A natural desire to satisfy a bodily need, especially for food.
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