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a=69-6+13
a=76
2)a-10-13=-21
a=-21+10+13
a=2
3)a-10=10
a=-10+10
a=0
4)5y+4=129
y=129-4:5
Y=25
5)Pkuadrat+4-8=229
pkuadrat=229-4+8
p=akr233