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kenoknox
03.12.2020 •
Mathematics
A.x+y=10
9x+4y=13
B.x-3y=-18
9x+4y=9
C.3x-y=2
4x+9y=36
D.3x-y=6
4x+9y=4
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Ответ:
3
Step-by-step explanation: