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x=8-5
x=3
________
3*b=12
b=12/3
b=4
_________
-8=-2*y
-8/-2=y
4=y
__________
2p+3=7
2p=7-3
2p=4
p=4/2
p=2
saludos
x=8-5 b=12/3
x=3 b=4
c) -8=-2*y d) 2p+3=7
-8/-2=y 2p=7-3
4=y 2p=4
p=4/2
p=2