方程式練習

1.
3x + 27 = 4x + 6
4x - 3x = 27 - 6
x = 21


2.
5x - 4 = 17 - 2x
5x + 2x = 17 + 4
7x = 21
x = 21/7
x = 3


3.
[4(3x + 6)/6] - 3 = 5
[2(3x + 6)/3] - 3 = 5
(6x + 12)/3 = 5 + 3
(6x + 12)/3 = 8
6x + 12 = 8 * 3
6x + 12 = 24
6x = 12
x = 12/6
x = 2

1. 3x+27=4x+6
3x-4x=6-27
-x=-21
x=21

2. 5x-4=17-2x
5x+2x=17+4
7x=21
x=21/7
x=3

3. 4(3x+6)
=12x+24.....(your question do not have answer , so i don't know how to do )

1. 3x+27=4x+6
3x-4x=6-27
-x=-21
x=21

2. 5x-4=17-2x
5x+2x=17+4
7x=21
x=3

3. 不明白你說什麽