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A=3
2.5-3=2
2:2=1
N=1
3.10-7=3
4.12:2=6
6:2=3
2p=3
P=6
a = 9 - 6
a = 3
b) 2n - 5 = 3
2n = 3 + 5
2n = 8
n = 8 : 2
= 4
c) 7 = 10 - p
p = 10 - 7
p = 3
d) 2p + p = 12
3p = 12
p = 12 : 3
= 4
e) x + x = -8
2x = -8
x = -8 : 2
= -4