1) 5n-3+n+6= 2) 5pq+k-7pq-k= 3) 4a-5b+4a= 1) 28x-15y+12x= 2) 17a^3-b^2-8-9a^3-b^2= 1) p^3+p^2-p+4= 2) 2k^2+4k^3s^3+3s^5= 3) 0,2n^3m-n^2m^3+nm^4

1)5n-3+n+6=0 ; 6n+3=0 ; n=3/6; n=0,5. 2) =- 2pq ; 3) =8a-5d;