21. –6p + 7 = 3(2p – 3) – 4(–10 + 4p) (1 point)
p = 6
p = 5
p = 7
p = 12

Question

21.   –6p + 7 = 3(2p – 3) – 4(–10 + 4p)  (1 point)
p = 6
p = 5
p = 7
p = 12

anonymous · Answer

p=6

agreene · Answer

p=6

just plug in 6 for p and evaluate, you will get 
-29 = -29

anonymous · Answer

-6p + 7 = 6p - 9 + 40 - 16p
-6p + 7 + 6p = 6p - 9 + 40 - 16p + 6p
7 = 6p - 9 + 40 - 16p + 6p
7 = 12p - 9 + 40 - 16p
7 = -4p + 31
-24 = -4p
-24/-4 = -4p/-4
6 = p

anonymous · Answer

That's a real pain to write out. 

First use the distributive property on the right hand side

Then isolate the variables, separating p

combine like terms

and solve for p  

(just as sean walsh patiently posted.)