Решите уравнения:. 2х=7, 12,4=4х+6, 4х+6=12,4, 14х-18=4х-4, 25-(7х-3)=28, 9-(2х+3)=2(4х-3)

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вопрос

1) 2x = 7
x = 7/2
x = 3.5

2) 12.4 = 4x + 6
4x = 12.4 - 6
4x = 6.4
x = 6.4/4
x = 1.6

3) 4x + 6 = 12.4
4x = 12.4 - 6
4x = 6.4
x = 6.4/4
x = 1.6

4) 14x - 18 = 4x - 4
14x - 4x = 18 - 4
10x = 14
x = 1.4

5) 25 - (7x - 3) = 28
25 - 7x + 3 = 28
-7x + 28 = 28
-7x = 0
x = 0

6) 9 - (2x + 3) = 2(4x - 3)
9 - 2x - 3 = 8x - 6
6 - 2x = 8x - 6
-2x - 8x = -6 - 6
-10x = -12
x = -12/-10
x = 1.2

Ответ: x = 3.5; x = 1.6; x = 1.6; x = 1.4; x = 0; x = 1.2