River level changes

The river level was 2 cm above normal at the beginning of the month, then rose by 5 cm. In the following days, it fell by 12 cm, then fell by another 9 cm, and finally rose by 7 cm. What was the river level relative to normal at the end of the month?

Final Answer:

x =  -7 cm

Step-by-step explanation:

x=2+5129+7=7 cm



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