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The seventh grade math book p 139 published by Beijing normal university, the first volume of classroom exercises answers.
(1) solution: denominator 3(3-x)=2(x+4)

Bracket removal 9-3x=2x+8

Transposition -3x-2x=8-9

Merge similar projects -5x=- 1

The conversion coefficient is 1 x= 1/5.

(2) Solution: Denominator 7(x+ 1)=3(2x-3).

Unbeared 7x+7=6x-9

Shift item 7x-6x=-9-7

The conversion coefficient is 1 x=- 16.

(3) Solution: Denominator 4(x+2)=5x.

Not worn 4x+8=5x

Shift items 4x-5x=-8

Merge similar projects -x=-8

The conversion coefficient is 1 x=8.

(4) solution: denominator 3(x+ 1)=4(x- 1).

3x+3=4x-4

Transposition 3x-4x=-4-3

Merge similar projects -x=-7

The conversion coefficient is 1 x=7.

(5) Solution: Denominator 4 (2x-1) = 3 (x+2)-12.

Unbracketed 8x-4=3x+6- 12.

Transposition 8x-3x=6- 12+4

Merge similar items 5x=-2.

The conversion coefficient is 1 x=-2/5.

(6) solution: denominator 5(x- 1)=20-2(x+2).

Unpacking 5x-5=20-2x-4

Transposition 5x+2x=20-4+5

Merge similar projects 7x=2 1

The conversion coefficient is 1 x=3.

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