Haha, very easy... :)
Answer:
H i think
Step-by-step explanation:
The sis that said hello 5 times higher said hello 10 times
The first sis said hay online 5 times
The second sis said hello 5 times higher
5 times higher meaning she said hello 10 times in total
2x+12-7x=-2
-5x+12=-2
-5x=-14
x=14/5