x-40%x=2/5 x-5/12=5/42除以5/28

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x-40%x=2/5 x-5/12=5/42除以5/28
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x-40%x=2/5 x-5/12=5/42除以5/28
x-40%x=2/5 x-5/12=5/42除以5/28

x-40%x=2/5 x-5/12=5/42除以5/28
x-40%x=2/5
0.6x=0.4
x=2/3
x-5/12=5/42除以5/28
x-5/12=5/42*28/5
x=5/12+2/3
x=13/12