Решите уравнения 3 × |5 - х| = 21; 2) |х - 4| × 6 =18; 3) 2 × |4х - 9| - 5 = 1; 4) 7 × |2х - 3| - 23 = 12

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вопрос

1) 3 × |5 - х| = 21
|5 - х| = 7
5 - х = 7 or 5 - х = -7
-x = 2 or -x = -12
x = -2 or x = 12

2) |х - 4| × 6 = 18
|х - 4| = 3
х - 4 = 3 or х - 4 = -3
х = 7 or х = 1

3) 2 × |4х - 9| - 5 = 1
2× |4х - 9| = 6
|4х - 9| = 3
4х - 9 = 3 or 4х - 9 = -3
4x = 12 or 4x = 6
x = 3 or x = 1.5

4) 7 × |2х - 3| - 23 = 12
7 × |2х - 3| = 35
|2х - 3| = 5
2х - 3 = 5 or 2х - 3 = -5
2x = 8 or 2x = -2
x = 4 or x = -1