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3y=18
y=6
spr.
9*6-11=6*6+7
54-11=36+7
43=43
18-8y=5y-y
18=4y+8y
18=12y
y=1,5
spr.
18-8*1,5=5*1,5-1,5
18-12=6
6=6
-21-3s=-17-12s
9s=4
s=4/9
spr.
-21-3*4/9=-17-12*4/9
-21-1 1/3=-17-5 1/3
-22 1/3=-22 1/3