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x=3是關於x的方程a(x-7)/3=a/7x+6的解 則a*(3-7)/3=a/7*3+6 -4/3a=3/7a+6 兩邊同時乘以21,得 -28a=9a+126 -28a-9a=126 -37a=126 a=-126/37
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