a) $$39,6x + 0,4x - 5,3 = 74,7$$
$$40x - 5,3 = 74,7$$
$$40x = 74,7 + 5,3$$
$$40x = 80$$
$$x = \frac{80}{40}$$
$$x = 2$$
Ответ: x = 2
б) $$97,3y - 17,3y + 9,3 = 97,3$$
$$80y + 9,3 = 97,3$$
$$80y = 97,3 - 9,3$$
$$80y = 88$$
$$y = \frac{88}{80}$$
$$y = 1,1$$
Ответ: y = 1,1