=(49*7)^(1/3)+(7*28)^(1/3)+(7*16)^(1/3)-(49*4)^(1/3)-(28*4)^(1/3)-(4*16)^(1/3)=
=7+196^(1/3)+112^(1/3)-196^(1/3)-112^(1/3)-4=7-4=3
=(49*7)^(1/3)+(7*28)^(1/3)+(7*16)^(1/3)-(49*4)^(1/3)-(28*4)^(1/3)-(4*16)^(1/3)=
=7+196^(1/3)+112^(1/3)-196^(1/3)-112^(1/3)-4=7-4=3