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2r +10t =2P+6r
-4r = 2P-10y /:(-4)
r=-1/2P+5/2y
r=-1/2P + 2 1/2y
T=t-2h/7u /*7u
7uT=t-2h
2h=t-7uT / :2
h=t/2 - 7uT/2