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2x+9=17
2x=17-9
2x=8 / : 2
x=4
Spr.
L=2·4+9=8+9=17
P=17
L=P
b).
1/3 y -3=4
1/3 y=4+3
1/3 y=7 / : 1/3
y=7·3
y=21
Spr.
L=1/3 ·21-3 = 7-3 = 4
P=4
L=P
c).
7z-2=12
7z=12+2
7z=14 / : 7
z=2
Spr.
L=7·2-2 = 14-2 = 12
P=12
L=P