1, solution: 7(2x+ 1)=49 (both sides of the equation are divided by 7 at the same time).

2x+ 1=7

2x=6

x=3

2. Solution: (x+8)÷8=6 (both sides of the equation are multiplied by 8 at the same time)

x+8=48

x=40

3. Solution: 4(x+3)=32×3

x+3=32×3/4

x+3=24

x=2 1

4. Solution: 3(x+5)-42= 12.

3(x+5)=54

x+5= 18

x= 13

5. Solution: (10x-90+2x)÷2=75 (both sides of the equation are multiplied by 2 at the same time)

10x-90+2x= 150

12x=240

x=20

6. Solution: (7x-3x+59)÷3=29 (both sides of the equation are multiplied by 3 at the same time)

7x-3x+59=87

4X+59=87

4X= 146

X=36.5

7. Answer: 9x-8 = X.

8x=8

x= 1

8. Solution:12x+12 =16x.

16x- 12x= 12

4x= 12

x=3

9. Solution: 144÷x+6= 12.

144÷x= 12-6

144÷x=6

6x= 144

x=24

10, solution: 125÷-5=5.

There is no unknown X on the topic. I guess the topic is 125÷x-5=5.

125÷x= 10

10x= 125

x= 12.5