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b)x=0,1 y=z=0
6x+7y-9z=6*3+7*(-2)-9*(-5) = 18-14+45=57.
6x+7y-9z=0,6
6*0,1 + 7*0 - 9*0=0,6+0+0=0,6
18+ (-14) - (-45)=
18- 14 + 45 = 49
b) 6 razy 0,1 +7razy 0 - 9razy0=
0,6+0-0=0,6