y+5x-7=0
x+2y=5
y=7-5x
x+14-10x=5
-9x=-9
x=1
y=2
2+5-7=0
0=0
1+4=5
5=5
x+2(7-5x)=5
2+5·1-7=0
L=P
1+2·2=5
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y+5x-7=0
x+2y=5
y=7-5x
x+14-10x=5
-9x=-9
x=1
y=2
2+5-7=0
0=0
1+4=5
5=5
y+5x-7=0
x+2y=5
y=7-5x
x+2(7-5x)=5
y=7-5x
x+14-10x=5
y=7-5x
-9x=-9
x=1
y=2
2+5·1-7=0
2+5-7=0
0=0
L=P
1+2·2=5
1+4=5
5=5
L=P