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-t-5t=4-2
-6t=2 /:(-6)
t=-1/3
y-3 = 9-y
y+y=9+3
2y=12 /:2
y=6
-6t=2 /: (-6)
t=jedna trzecia
y+y=9+3
2y=12 /: 2
y=6