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2p = 7-1
2p = 6
p = 3
2. 5q-1=-16
5q = -16+1
5q =-15
q = -15/5 = -3
3. 3n+2 = 2n-1
3n-2n = -1-2
n = -3
2. 5q -1 = -16 ( 5q= -16 +1 | 5q = -15 | q = -15:5= -3)
3. 3n + 2 = 2n -1 ( 3n -2n = -1 - 2| n= -3)