Question

3(2х -5) =4х +15

-(3х-4) = 3х-8

2а-(14-3а) = -10

1,2( х - 5) = 0,2х + 6

6 (4х - 7) -3( 5 - 8х) = 0


Решите пж ​

Answer 1

Ответ:

$1)3(2x - 5) = 4x + 15 \\ 6x - 15 = 4x + 15 \\ 6x - 4x = 15 + 15 \\ 2x = 30 \\ x = \frac{30}{2} \\ x = 15$

$2) - (3x - 4) = 3x - 8 \\ - 3x + 4 = 3x - 8 \\ - 3x - 3x = - 8 - 4 \\ - 6x = - 12 \\ x = \frac{ - 12}{ - 6 } \\ x = 2$

$3)2a -(14 - 3a) = - 10 \\ 2a - 14 + 3a = - 10 \\ 2a + 3a = - 10 + 14 \\ 5a = - 24 \\ a = \frac{ - 24}{5} \\ a = - 4.8$

$4)1.2(x - 5) = 0.2x + 6 \\ 1.2x - 6 = 0.2x + 6 \\ 1.2x - 0.2x = 6 + 6 \\ x = 12$

$5)6(4x - 7) - 3(5 - 8x )= 0 \\ 24x - 42 - 15 + 24x = 0 \\ 48x - 57 = 0 \\ 48x = 57 \\ x = \frac{57}{48} \\ x = \frac{19}{16 } \\ x = 1 \frac{3}{16}$