statins are used to keep

Question

Statins are used to keep cholesterol in check and are a top-selling drug in the U.S. The equation:

S−1.3x=5.3

gives the amount of sales (S) of statin in billions of dollars xx years after 1998. According to this equation, how much will/did people in the U.S. spend on statins in the year 2018?

Answer: People in the U.S. will spend billion dollars on statins in 2018.

Answer 1

S - 1.3(2018 - 1998)x = 5.3

Can you solve for x and answer?