Ответ:
2x+30+x+12=69
2x+x=69-30-12
3x =27
x=9
9+12=21=MA
Объяснение:
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Ответ:
2x+30+x+12=69
2x+x=69-30-12
3x =27
x=9
9+12=21=MA
Объяснение: