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-6+8*2-(-3)-2*2=-6+16+3-4=21
-8y-4z+x-y-2z+1
-8*(-0,5)-4*2+(-0,5)-(-1)-2*2+1=4-8-0.5+1-4=-7,5
9y-(7y+x)+(6x-7y)
9*3-(7*3+(-2))+(6*(-2)-7*3)=27-(21-2)+(-12-21)=27-21+2+(-12)-21=-25
* znaczy razy
-8*(-1)-4*2+0.5-(-1)-2*2+1=16
9*3-(7*3+(-2))+(6*(-2)-7*3=