數學題！救命啊 ！

7Q=15+11Q-3
7Q=12+11Q
7Q-11Q=12
-4Q=12
Q=12/ -4
Q=-3

This is the simple maths question!

First you must think Q is postive or negtive
Then you can atart your matyhs queation

7Q=15+11Q-3
[Put the Unknown number in one side][CAUTION:when you cahnge the number to other side must + change to - & - change to +]
7Q-11Q=15-3
[nothing say in this step]
-4Q=12
[divide 4 togrther]
-Q=3
[simple part]
Q=-3
~~!!!![FINISH]!!!!~~

2007-09-24 17:59:05 補充：
matyhs=maths

7Q=15+11Q-3
7Q+3=15+11Q
7Q+3-15=11Q
7Q-12=11Q
-12=11Q-7Q
4Q=-12
Q=-3

7Q=15+11Q-3
7Q=12+11Q

7Q-11Q=12

-4Q=12

Q=12/ -4

Q=-3
hope可以help到你

7Q=15+11Q-3
7Q=12+11Q
-4Q=12
Q=12/-4
Q=-3

7Q=15+11Q-3
7Q=15-3+11Q
7Q=12+11Q
7Q-11Q=12
-4Q=12
-12=4Q
-3=Q
Q=-3

7Q=15+11Q-3
-15+3=11Q-7Q
-12=4Q
-3=Q
Q=-3

7Q=15+11Q-3
7Q-11Q=15 - 3
-4Q = 12
Q = 12/-4
Q = -3

+3 = 15+11Q-7Q
+3-15 = 4Q
-12 = 4Q
-12/4 = Q
Q = -3