Question

450-х=60•7
480:х=100:10

Answer 1

450-х=60*7
450-х=420
х=450-420
х=30
проверка:
450-30=60*7
    420=420

480:х=100:10
480:х=10
х=480:10
х=48
проверка:
480:48=100:10
     10=10

Answer 2

450-х=60•7450-х=420
х=450-420
х=30
____________
450-30=60х7
       420=420


480:х=100:10
480:х=10
х=480:10
х=48
________________
480:48=100:10
       10=10