a) [tex]8a+(4a-7)=8a+4a-7=12a-7[/tex]
b) [tex]5a-(3a+6)=5a-3a-6=2a-6[/tex]
c) [tex]-8m+(2n-m)=-8m+2n-m=-9m+2n[/tex]
d) [tex]-3p-(6r-4p)=-3p-6r+4p=p-6r[/tex]
e) [tex]2x-7y+(5x-2y)=2x-7y+5x-2y=7x-9y[/tex]
f) [tex]-2x+8y-(6x-7y)=-2x+8y-6x+7y=-8x+15y[/tex]
g) [tex](3u-6v)+(6v-5)=3u-6v+6v-5=3u-5[/tex]
h) [tex](8u+3v)-(2u+5v)=8u+3v-2u-5v=6u-2v[/tex]
i) [tex](-a-4b)+(5b-a)=-a-4b+5b-a=-2a+b[/tex]
j) [tex](7a-b)-(4a-2b)=7a-b-4a+2b=3a+b[/tex]
