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(2x-y+4)-(z+14y)+1/2 z =
2x-y+4-z-14y+½z =
2x-15y-½z+4
b)
(-2x +4/5y -2z) +(2z-0,2y +2x) =
-2x+⅘y-2z+2z-0,2y+2x =
0,6y
c)
4z-2e-(12a +3z - 1,5e) =
4z-2e-12a-3z+1,5e =
z-0,5e-12a
d)
12y-(3x-8y) + (2x - 4y)+x =
12y-3x+8y+2x-4y+x =
0