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= 7.(2-√8) / (2+√8).(2-√8) + 11.(2+√8) / (2-√8).(2+√8)
= 14-7√8+22+11√8 / 4-8
= 14+22-7√8+11√8 / -4
= 36+4√8 / -4
= -9-√8