Чему равен корень уравнения 1) 4x = 35 - x 2) 8x - 12 = 5x - 30 3) -5x - 33 = 8x - 72

Question

Чему равен корень уравнения 1) 4x = 35 - x 2) 8x - 12 = 5x - 30 3) -5x - 33 = 8x - 72

Answer 1

4х = 35 - х

4х + х = 35

5х = 35

х = 35/5

х = 7

8х - 12 = 5х - 30

8х - 5х = 12 - 30

3х = - 18

х = - 18/3

х = - 6

- 5х - 33 = 8х - 72

- 5х - 8х = 33 - 72

- 13х = - 39

х = - 39/(-13)

х = 3

Answer 2

1) 4х=35-х

4х+х=35

5х=35

х=7

2) 8x - 12 = 5x - 30

8х-5х=-30+12

3х=-18

х=-6

3) -5x - 33 = 8x - 72

-5х-8х=33-72

-13х=-39

х=3