Răspuns :
607-299=308
308:n+299=607-231
607-231=376
308:n+299=376
308:n=376-299 308:n=77
n=308:77-=4
n=4
(607-299)÷n+299=376
308÷n+299=376
308÷n=376-299
308÷n=77
n=308÷77
n=4
(607-299)÷4+299=376
308÷n+299=376
308÷n=376-299
308÷n=77
n=308÷77
n=4
(607-299)÷4+299=376