5x-3Ⅹ5/21=5/7-7x
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解：解方程, 此方程的解为x = 5/42
5x - 3Ⅹ5/21 = 5/7 - 7x
5x - 5/7 = 5/7 - 7x
5x + 7x = 5/7 + 5/7
12x = 10/7
x = 10/7 ÷ 12
x = 10/7 × 1/12
∴x = 5/42
答：此方程的解为x = 5/42
5x - 3Ⅹ5/21 = 5/7 - 7x
5x - 5/7 = 5/7 - 7x
5x + 7x = 5/7 + 5/7
12x = 10/7
x = 10/7 ÷ 12
x = 10/7 × 1/12
∴x = 5/42
答：此方程的解为x = 5/42
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