maths

k = 2w - 3
2w = k + 3
w = (k + 3)/2

when k = 6,
w = (6 + 3)/2
w = 4.5

6 = 2w - 3
6 + 3 = 2w
9 = 2w
9 ÷ 2 = 2w ÷2
4.5 = w
w = 4.5






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