Răspuns:
3.x + 7 y = 5 /×(-5)
5x-2y = -19 /×3
-15x-35y=-25
15x-6y=-57
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/ -31y=-82
y=(-82)/(-31)
y=82/31
3.x + 7 y = 5 /×2
5x-2y = -19 /×7
6x+14y=10
35x-14y=-133
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41x / =-123
x=-123/41
