1) 11х – 9 = 4х + 19 2)7x – 5(2x + 1) = 5x + 15.

Question

1) 11х – 9 = 4х + 19 2)7x – 5(2x + 1) = 5x + 15.

Answer 1

1)11х-9=4х+19

11х-4х=19+9

7х=28

х=28:7

х=4

 

2)7х-5(2х+1)=5х+15

7х-10х-5=5х+15

7х-10х-5х=15+5

-8х=20

х=20:(-8)

х=-2,5

Answer 2

 1)11х-4х=19+9

    7х=28

     х=28/7

     х=4

2)7х-10х-5=5х+15

7х-10х-5х=15+5

-8х=20

х=20/(-8)

х=-2,5