Ответ:
1)7х-5 = 3х+1
7х-3х = 1+5
4х = 6
<u>х = 1,5</u>
2)6х-2 = 4х+6
6х-4х = 6+2
2х = 8
<u>х = 4</u>
3)9х = 7+8
9х = 15
<u>х = 15/9 = 5/3 = 1 2/3</u>
4)х-6 = 2х+8
х-2х = 8+6
-х = 14
<u>х = -14</u>
5)11х-5 = 20х+20
11х-20х = 20+5
-9х = 25
<u>х = -(25/9) = -2 7/9</u>.
Объяснение:
1) 7х-5=3х+1
4x=6
x = 6/4 = 3/2
2) 6x-2=4x+6
2x=8
x=4
3) 9x = 7+8
9x = 15
x = 15/9 = 5/3
4) x-6 = 2x+8
-x = 14
x = -14
5) 11x-5=20x+20
-9x = 25
x = -25/9
решение смотри на фотографии