Ответ:
30+a=70
A=70-30
A=40
______
A-7=10
A=10+7
A=17
_____
9-X=6
X=9-6
X=3
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Ответ:
30+a=70
A=70-30
A=40
______
A-7=10
A=10+7
A=17
_____
9-X=6
X=9-6
X=3