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165.16 = 164.15 + x
2640-2460 = x
x = 180
2. 74 = 76 x 35 + 5x/40
74 x 40 = 76 x 35 - 5x
2960 - 2660 = 5x
300 = 5x
x = 60
3. 65 x 11 + 70 x 9/20
715 + 630/20
1345/20
67,25