a) 6a+12a-6a+9b=12a+9b
b) 4b+12+3a-3b= b+12+3a
c)7b+7c-3b-6c=4b+c
d) 5a+15+2b-3a-3b=2a+15-b
e)18+6z-8z-16+16+2z=18
f) -8x+28+12y+12y+12x=4x+28+24y
a)6(a+2a)-3(2a-3b)=6a+12a-6a+18b=12a+18a
b)4(b+3)+3(a-b)=4b+12+3a-3b=b+12+3a
c)7(b+c)-3(b+2c)=7b+7c-3b-6c=4b+c
d)5(a+3)+2b-3(a+b)=5a+15+2b-3a-3b=2a-b+15
e)6(3+z)-4(2z+4)+2(8+z)=18-6z-8z-16+16+2z=18-12z
f)-4(2x-7-3y)-12(-y-x)=-8x+28+12y+12y+12x=4x+28+24
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a) 6a+12a-6a+9b=12a+9b
b) 4b+12+3a-3b= b+12+3a
c)7b+7c-3b-6c=4b+c
d) 5a+15+2b-3a-3b=2a+15-b
e)18+6z-8z-16+16+2z=18
f) -8x+28+12y+12y+12x=4x+28+24y
a)6(a+2a)-3(2a-3b)=6a+12a-6a+18b=12a+18a
b)4(b+3)+3(a-b)=4b+12+3a-3b=b+12+3a
c)7(b+c)-3(b+2c)=7b+7c-3b-6c=4b+c
d)5(a+3)+2b-3(a+b)=5a+15+2b-3a-3b=2a-b+15
e)6(3+z)-4(2z+4)+2(8+z)=18-6z-8z-16+16+2z=18-12z
f)-4(2x-7-3y)-12(-y-x)=-8x+28+12y+12y+12x=4x+28+24