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2x+5=-3
3z=1
1-7y=+8


Răspuns :

2x=-3-5
2x=2
x=0. :) atata stiu

2x+5=-3
2x=-3-5
2x=-8
x=-4
S={-4}

3z=1
z=1/3
S={1/3

1-7y=8
-7y=8-1
-7y=7
y=-1
S={-1}