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21-27=-8x + 6x
-6 =-2 x
-6/-2 =x
x = 3
8-5x=8-2y
8-5x-8+2y=0
2y-5x =0 ó y=5x/2
5(x-3)+8x=6x-5+x
5x-15+8x-6x+5-x=0
5x+8x-6x-x-15+5=0
6x-10=0
6x=10
x=10/6
x=5/3
5y+6y-81=7y+102+654
5y+6y-7y=102+654+81
4y= 837
y=837/4