-56.7x-(4.78-46.7x), если x=-9.1

-56.7x - 4.78 + 46.7x = -10x -  4.78 = 91 - 4.78 = 86.22

- 56,7х - (4,78 - 46,7х) =- 56,7х - 4,78 + 46,7х =- 10х - 4,78 = при х = - 9,1- 10 * (- 9,1) - 4,78 = 91 - 4,78 = 86,22