Question

is x = -3 a solution of 8 ( x + 3 ) = 7 ( x + 3)

Answer 1

yes

Answer 2

so 0 = 0 is a valid solution? no other x value works in this case if you divide both sides by x+3 all values of x do not work except -3

Answer 3

yes if you divide, you must write condition that x is not equal to zero, and you'll get 8=7