18. 3/-5=-3/5
19. y+2=-2/3x-2/3
-2x-3y=8
2x+3y=-8
20. l+4+l=36
l=16
p=20
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18. 3/-5=-3/5
19. y+2=-2/3x-2/3
-2x-3y=8
2x+3y=-8
20. l+4+l=36
l=16
p=20