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15/5x - 4/5x = 1/10
11/5x = 1/10
110 = 5x
x = 22
15/5× - 4/5× = 1/10
11/5× = 1/10
22/10× = 1/10
× = 1/10 : 22/10 =
× = 1/10 × 10/22
× = 10/ 220
× = 1/22