Ответ:
1) x+8=23
x=23-8
x=15
2) x-9=17
x=17+9
x=26
3)23-x=15
-x=15-23
x= -15+23
x= 8
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Ответ:
1) x+8=23
x=23-8
x=15
2) x-9=17
x=17+9
x=26
3)23-x=15
-x=15-23
x= -15+23
x= 8