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80 - x = 71/2
160 - 2x = 71
2x = 160 - 71
2x = 89
x = 89/2
x/5 + 10 = 30
x/5 = 30 - 10
x/5 = 20
x = 100
56 - 3x = 38
3x = 56 - 38
3x = 18
x = 6