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