Решите уравнение: 3x - 5 ( 2x + 1 ) = 3 ( 3 - 2x ) | 7x - 3 | = 11 16у^2 - 49 = 0

Question

Решите уравнение:
3x - 5 ( 2x + 1 ) = 3 ( 3 - 2x )
| 7x - 3 | = 11
16у^2 - 49 = 0

Answer 1

3Х - 5(2Х + 1) = 3 (3 - 2х)
3Х - 10Х - 5 = 9 - 6х
-7Х - 5 - 9 + 6Х = 0
-Х = 14
Х = -14

7Х - 3 = 11
7Х = 14
Х = 2

16у^2 - 49= 0
(4у-7)(4у+7)=0
4у-7=0 и 4у+7=0
4у=7 и 4у=-7
У=1,75 и у= -1,75