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2010-02-23T17:09:15+01:00
-(x+4)+(x-5) =-x-4+x-5=-9
1 - (t+p)-(t-2)=1-t-p-t+2=-2t-p+3
7-(-x+6)=7+x-6=x+1
-(-y+2) +(-2y-4)=y-2-2y-4=-y-6
2010-02-23T17:09:23+01:00
-(x+4)+(x-5) = -x-4+x-5 = -9

1 - (t+p)-(t-2)= 1-t-p-t+2 = -2t -p +3

7-(-x+6)= 7+x-6 = x +1

-(-y+2) +(-2y-4)= y-2-2y-4= -y -6