Ответ:
5. y=7-5x
3x-14+10x-12=0
13x-26=0
x=2 y=-3
6. 12x=60
x=5 y=4
7. -
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Ответ:
5. y=7-5x
3x-14+10x-12=0
13x-26=0
x=2 y=-3
6. 12x=60
x=5 y=4
7. -