Question 479690
{{{10x + 2x^2 - 6x^3 + 5 (6x + 4x^2 - 3x^3)=10x + 2x^2 - 6x^3 + 5 *6x + 5*4x^2 -5* 3x^3=10x + 2x^2 - 6x^3 + 30x + 20x^2 - 15x^3=40x+22x^2-21x^3}}}