Question 372879
{{{((1/3)x^9 + (1/2)x^5 - (1/2)x^2 + 7)+((-1/5)x^9 + (1/4)x^4 - (3/5)x^5)}}} 
= {{{(1/3 - 1/5)x^9 + (1/2 - 3/5)x^5 +(1/4)x^4 - (1/2)x^2 + 7}}}
={{{(2/15)x^9 - (1/10)x^5  + (1/4)x^4 - (1/2)x^2+7}}}
={{{2x^9/15 - x^5/10 + x^4/4 - x^2/2 + 7}}}.