Помогите решить систему уравнений методом сложением!!!
1)3x-y=3
3x-2y=0
2)2x-3y=1
3x+y=7
3)x+y=6
5x-2y=9
4)x+5y=7
3x+2y=-5
5)x+y=7
5x-7y=11
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