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The title of the eighth chapter of mathematics in the second volume of seventh grade! ! ! ! !
1 ①，y，x，②

2. From ①: 4x-4y-4 = 3-3y-2

4x-2=3+y

y=4x-5

Bring in 2: 3x+2 (4x-5) = 2.

3x+8x= 12

x= 12/ 1 1

y=-7/ 1 1

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