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Answer:
86 = w
Step-by-step explanation:
The perimeter of a triangle is
P = 2(l+w)
368 = 2(98+w)
Divide each side by 2
368/2 = 2/2(98+w)
184 = 98+w
Subtract 98 from each side
184-98 = 98+w-98
86 = w