Question

if 7 is added 7 times it reasult 28. find the number

Answer 1

Answer:

$x + 7 + 7 + 7 + 7 + 7 + 7 + 7 = 28 \\ x + 49 = 28 \\ x = 28 - 49 \\ x = - 2 1$

The number is (-21)