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...........2x = 4x - 60
.......2x+60=4x-60+60
...... 2x+60=4x
..2x-2x+60=4x-2x
.............60=2x
......... 60/2=2x/2
.............30=x
..............x=30
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4x-2x= 60
2x = 60
x= 60/2
x= 30

2x = 4x - 60
2x-4x=-60
-2x=-60
-2x/2=-60/2(記住負負得正呀!）
x=+30

2006-12-17 16:58:04 補充：
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2x = 4x -60
60 = 4x -2x
60 = 2x
x = 30

2x=4x-60
2x+60=4x
60=4x-2x
60=2x
30=x

2x=4x-60
60=4x-2x
60=2x
x=30

X是=30.

2x = 4x - 60
60=4x-2x
60=2x
2x=60
x=30

2x = 4x - 60
60 = 4x - 2x
60 = 2x
x = 60 除 2
x = 30

4x -2x = 60
2x = 60
x = 30