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5.
2+p= 3p - 4
-2p = -4-2
-2p=-6
p=3

2p + q = -1
2(3)+q=-1
q=-1-6
q=-7

2p+6r = 3q+3
2(3)+6r = 3(-7)+3
6+6r=-21+3
6r=-18-6
6r=-24
r=-24/6
r=-4

s+1 = 2r-q
s= 2(-4)-(-7)-1
s=-6+7-1
s=0

r+7=6s+t
-4+7=6(0)+t
t=3


q+2p= u
2(-7)+2(3)=u
u=-14+6
u=-8