Question

Плиз помогите с работой

Answer 1

$-cfrac{2}{49}c^7y +cfrac{1}{7}c^7y +cfrac{1}{49}c^7y = -cfrac{2}{49}c^7y +cfrac{7}{49}c^7y +cfrac{1}{49}c^7y =cfrac{6}{49}c^7y$