[tex]a) 4x-7-5x+3=-x-4\\b) 2y+11x-2.1-2\frac23y-x+8\frac13y-1.9=13y+11x-4\\c) x^2+8x-9-34x^2-x+3=-33x^2+7x-6\\d) 9+5x-9x^3+9x^2-6-3x^2-x+x^2=-8x^3+7x^2+4x+3\\e) 2x-4y+9xy-4-6y-7x+yx=-5x-10y+10xy-4\\f) pq+2q^2p-6\frac12qp+\frac16pq-8pq^2=-5\frac13pq-6pq^2[/tex]