-3/2x^2y^4+(-4x^4y)+1/7x^2y^4-(-2x^4y)-3/2x^2y^4-4x^4y+1/7x^2y^4+2x^4y(-3/2+1/7)x^2y^4-4x^4y+2x^4y(-21+2)/14x^2y^4-2x^4y-(19/14)x^2y^4-2x^4y