What is the value of x

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Ten times the square of a non-zero number is eqaul to ninety times the number

Which expression is equivalent to -5(3x - 6/7)