Question

The sum of -7 times a number and 8 times the sum of the number and 1 is the number minus 7

Answer 1

n-the number

-7 · n + 8 · (n + 1) = n - 7

-7n + 8(n + 1) = n - 7

solution:

-7n + 8n + 8 = n - 7

n + 8 = n - 7 |subtract n from both sides

8 = -7 FALSE

Answer: no solution ( n∈∅)