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K-Kasia
M=K+7
M+3=2(K+3)
M=K+7
M+3=2K+6
M= K+7
M-2K=6-3
M=K+7
K+7-2K=3
M=K+7
-K=-4|/(-1)
M=K+7
K=4
M=7+4
K=4
M=11
K=4
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