1)
2)
1)x+9-10=34
x-1=34
x-1+1=34+1
x=34+1
x=35
2)1200=7x-18-x
1200=6x-18
-6x=-1218
x=-1218:6
x=203
Объяснение:
1)
2)
1)x+9-10=34
x-1=34
x-1+1=34+1
x=34+1
x=35
2)1200=7x-18-x
1200=6x-18
-6x=-1218
x=-1218:6
x=203
Объяснение: