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y=6
10y+20=6y+24
4y=4
5y-4y=4-10
y= -6
10y+20=6y+24
10y-6y=24-20
4y=4
y=4/4
y=1
6a+18=2a+2
6a-2a=2-18
4a=-16
a=-16/4
a=-4
[no se si es una a o un 9 tomate un 9]
7f+35=9f+27
7f-9f= 35-27
-2f=8
f=8/(-2)
f=-4