6.8 (x-3.6)= 0.8x

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6.8 (x-3.6)= 0.8x
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6.8 (x-3.6)= 0.8x
6.8 (x-3.6)= 0.8x

6.8 (x-3.6)= 0.8x
6.8 (x-3.6)= 0.8x
6.8 x-6.8×3.6=0.8x
6x=6.8×3.6
x=4.08

6.8x-6.8*3.6=0.8x
6x=6.8*3.6
x=6.8*0.6
x=4.08

太简单了楼下已解

等于4.08

6.8 (x-3.6)= 0.8x
6.8x-24.48=0.8x
6x=24.48
x=4.08