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b)2z+t-3z+4t-1=5t-z-1=5×0,1-5-1=0,5-6=-5,5
c)13x-2y+7-9x+y-4+x-3=5x-y=5×0,2-(-1)=1+1=2
d) n² +n-7+3n²-n-9-n+1=4n²-n=4×(-1/2)²-(-1/2)=1+1/2=