Question

Elght times a number increased by 9 Is the same as 15 more than 7 times the number ?

Answer 1

:let x = the number

then 8x + 9 = 9x

solving, x = 9

Proof: (8 x 9) + 9 = 9 x 9; 72 + 9 = 81, and 81 = 81