1.

3x +5 = 8x - 15

3x-8x = -5 -15

-5x= -20 | -5

x= 4

2.

3x+16 = 8x -9

3x-8x= -16-9

-5x= -25|-5

x=5

3.

4+25y= 6+24y

25y-24y= -4+6

y=2

4.

4(x-3) -16 = 5(x-5)

4x-12-16= 5x-25

4x-5x= 12+16-25

-x=3

x=-3

5.

5x+27 = 4x+21

5x-4x= -27+21

x=-6

6.

4(3-2y)-42 = 2(3+2y)

12-8y -42= 6+4y

-8y-4y = -12+42+6

-12y=36|-12

y=-3

7.

3(4x-8)=3x-6

12x-24= 3x-6

12x-3x=24-6

9x=18|9

x=2

9.

3(5-x)+13=4(3x-8)

15-3x+13=12x-32

-3x-12x=-15-13-32

-15x=60|-15

x=-4