Ответ:
72-(x-12)=15
72-x+12=15
84-x=15
-x=15-84
-x=-69
x=69
x+7=3+27
x+7=30
x=30-7
x=23
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Ответ:
72-(x-12)=15
72-x+12=15
84-x=15
-x=15-84
-x=-69
x=69
x+7=3+27
x+7=30
x=30-7
x=23