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It is 7 - 8c.
4(9)-11=25 2(9)+7=25 d=9
14s 2d 7 - 6s 4d 5 + 8s 2d 3/2s 2d = 14s 7 - 3s 2s 5 + 4s 3
If 16 - 7d = -3 d + 2, collecting like terms with "d" on the left side yields -4d = -14, or d = 14/4 = 7/2.
7 + 5 + 4 ÷ 2 + 7 = 21