Random Math Question.. Help!

[SunChip]

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This isn't MCAT related, but can anyone help me solve this for a friend? 🙂

2/3 (21x+12)-13=1/5(35x-35)

Thanks in advance!

 

[chemtopper]

open the brackets
2x21/3 x+ 2x12/3-13= 35x/5-35/5
14x + 8-13= 7x-7
14x-7x= 13-8-7
7x= -2
x=-2/7

 

[patrickmbyrne]

15*(2/3 (21x+12)-13=1/5(35x-35))
210x+120-195=105x-105
210x-75=105x-105
105x=30
21x=6
x=6/21

 

[inasensegone]

15*(2/3 (21x+12)-13=1/5(35x-35))
210x+120-195=105x-105
210x-75=105x-105
105x=30
21x=6
x=6/21

To be honest, I didn't want to reply to this because I'm not really sure why you even resurrected such an old non-MCAT-related post in the first place, but I feel like I must point out that your math is wrong. Chemtopper did it correctly. The correct answer is -2/7