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3y-8y=-9-6
-5y=-14
y=-14/(-5)
y=2,8
3y-8y=-9-6
-5y=-15 /:(-1)
y=3
3y-8y=-9-6
-5y=-15/:-5
y=3
sprawdzenie:
3y+6=8y-9
3×3+6=8×3-9
15=15