https://www.gregmat.com/quizzes/quiz/im-overwhelmed-arithmetic-progress-quiz-6 (Question 11)
I’m having a hard time with the remainders of negative numbers. In the solution video you did (- 4 * 4)
to get -16 so the remainder of -15 by 4, is 1.
How did you know to multiply by -4? on the other side you multiplied by 2 to get the remainder.