What is the solution to the system of equations below? y = three-fourths x minus 12 and y = negative 4 x minus 31

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Ineed asap.i cant understand this question i need someone to me right away

What is a possible solutions of the x> 3?