Помогите решить уравнения:

1) 1/3+1=-1/4 (х+4/5)

2) 2 х + (5-7 х) = 15

3) 5 х+3=-3 х+19

4) 3 х+4 (5-3) = - 7

2 х + (5-7 х) = 15

2 х-7 х=15-5

-5 х=10

х=10: (-5)

х=-2

2 * (-2) + (5-7 * (-2)) = 15

-4 + (5+14) = 15

-4+19=15

15=15

5 х+3=3 х+19

5 х-3 х=19-3

2 х=16

х=16:2

х=8

5*8+3=3*8+19

43=43

3 х+4 (5-3) = - 7

3 х+4*2=-7

3 х+8=-7

3 х=-7-8

3 х=-15

х=-15:3

х=-5

3 * (-5) + 4 (5-3) = - 7

-15+8=-7

-7=-7