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___ + ______ - 36= 0 mnożymy obie strony równania przez 14
7 2
14(w-2)/7+14(9w+7-2w)/2-36*14=0
2(w-2)+7(9w+7-2w)-504=0
2w-4+63w+49-14w-504=0
2w+63w-14w=504-49+4
51w=459
w=9