0.64x+1.8*9=2.

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0.64x+1.8*9=2.
0.64x+1.8*9=2.

0.64x+1.8*9=2.
0.64x+1.8*9=2.58
064x+16.2=2.58
0.64x=2.58-16.2
0.64x=-13.62
x=--681/32

0.64x=-13.62,得x=-681/32