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b)3a-b+5a+2b-6=8a+b-6
c) x+2y-3y-3z+5z-x=2z-y
d) 3 (x-4z+y+4x-z+2y)=3x-12z+3y+12x-3z+6y=15x-15z+9y
b)3a-b+5a+2b-6=8a+b-6
c) x+2y-3y-3z+5z-x=2z-y
d) 3 (x-4z+y+4x-z+2y)=3x-12z+3y+12x-3z+6y=15x-15z+9y