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How to solve the fifth problem of volume 1 of the fifth grade mathematics learning practice park 34?
When (2x-40)÷ 10=0

Deduce 2X-40=0.

So X=20.

When (2x-40) 10 = 1

Deduct 2x-40= 10

So X=25.

When (2x-40) 10 = 10

Deduct 2x-40= 100

So X=70.

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