five times the sum of a number and 8 is -15.
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the sum of 8 and 4 times a number is 36
8(5+4)+7 = 79
The sum of 8 and 5 is 13. There is then no number with which to calculate its product.
This is simple algebra. Let the unknown number be n. Then the sum of this number and 8 = n + 8.