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-5z-2z=-7-6
-7z=-13
z=13/7
Spr.
L=6-5*13/7=42/7-65/7=-23/7
P=2*13/7-7=26/7-49/7=-23/7
L=P
7a-8=-a+24
7a+a=24+8
8a=32
a=4
Spr.
L=7*4-8=28-8=20
P=-4+24=20
L=P
-5z-2z= -7-6
-7z= -13/:(-7)
z= 13/7
spr
6-5*13/7=2*13/7-7
6-65/7=26/7-2
6-9 2/7=3 5/7-7
-3 2/7=-3 2/7
L=P
7a-8= -a+24
7a+a=24+8
8a=32/:8
a=4
spr
7*4-8= -4+24
28-8=20
20=20
L=P