The solution equation: (y minus 4) (y minus 3) (y minus 2) (y minus 1) plus 1 equals zero

The solution equation: (y minus 4) (y minus 3) (y minus 2) (y minus 1) plus 1 equals zero

3（x-1）=4（y-4）…………………… （1）
5（y-1）=3（x+5)……………………… （2）
(1) (2), then: 3x-3 + 5y-5 = 4y-16 + 3x + 15
That is: 5y-8 = 4y-1, the solution is: y = 7
Substituting y = 7 into (1), there is: 3 (x-1) = 12, and the solution is: x = 5
So x = 5, y = 7

English translation
One tends to believe whatever one repeats to oneself sufficiently often,whether the statement be true or false.

People tend to believe anything they repeat to themselves, whether it's true or not

How much is 15 minus 3______________ Three? How?

What is fifteen minus