13x-6.8x+x=46.

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13x-6.8x+x=46.

13x-6.8x+x=46.8
7.2x=46.8
x=6.5


13x-6.8x+x=46.8
14x-6.8x=46.8
7.2x=46.8
x=6.5

13x-6.8x+x=46.8
6.2X+X=46.8
7.2X=46.8
X=6.5

13x-6.8x+x=46.8
7.2x=46.8
0.8x=5.2
x=13/2

13x-6.8x+x=46.8
(13-6.8+1)x=46.8
7.2x=46.8
x=6.5

提取公因式(13-6.8+1)x=46.8
则 7.2x=46.8
x=6.5