3(4-P)=2(p+3)急需10點

3(4-P) = 2(P+3)

Step 1 : Expand

12 - 3P = 2P + 6

Step 2: put all the 'Ps' to one side

12 - 6 = 2P + 3P

Step 3: Tidy and solve

6 = 5P
P = 5/6

2013-01-01 14:29:35 補充：
**** I meant

6 = 5P
P = 6/5

3(4-p)=2(p+3)
12-3p=2p+6
-5p=-6
p=6/5

3(4-p)=2(p+3)
12-3p=2p+6
-3p-2p=6-12
-5p=-6
p=-6/-5
p=1.2