układy równań
1. 5=3x-y
5x-2y=7
2. x-3y=5
y=3x=-5
3. 2x-3y=7
3x-5y=11
4. 5p-2r=21
3p+5r=-6
5. 2x-3y=10
5x+5y=0
6. 5V1+4V2=4
7V1+5V2=6
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