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X 3 7 1
1 2 3 x 7 11
2 5 x 1 7 x 3 4
x cdot frac 7 3 u003d 1
8 9 x 1 3 7
7 x 45 13 3 1 )
3(x+2)-2x-1)u003d7
1 2x 7 1 3 x 12
x 3 1 7 15
8x 4 3 x_1 )+ 7
x 3 7 1
