Математика help me

1) 11x + 15 = 7x - 25
11x - 7x = -25 - 15
4x = -40
x=-10

2) 16x - 28 = 8x - 44
16x - 8x = 28 - 44
8x = -16
x=-2

3) 4x - 15 = -7(9 + x)
4x - 15 = -63 - 7x
4x + 7x = 15 - 63
11x = -48
x = -4 4/11 (минус четырне целых четыре одиннадцатых)

4) 17x - 8 = 20x + 9
17x - 20x = 9 + 8
-3x = 17
x = - 5 2/3

5) 21x + 24 = 34x + 3
21x - 34x = 3 - 24
-13x = - 21
x = 1 8/13

6) 1.6(x - 2) + 3.4 = 0.7(4 + x)
1.6x - 3.2 + 3.4 = 2.8 + 0.7x
1.6x - 0.7x = 2.8 + 3.2 - 3.4
0.9x = 2.6
x = 2.6/0.9
x = 26/9
x = 2 8/9

7) 0.3(x - 9) - 4.8 = 0.3(5 - x)
0.3x - 2.7 - 4.8 = 1.5 - 0.3x
0.3x + 0.3x = 1.5 + 2.7 + 4.8
0.6x = 9
x = 15

8) (x+4)/(x-6) = 9/2
2(x+4) = 9(x-6)
2x + 8 = 9x - 54
2x - 9x = -54 -8
-7x = -62
x = 8 6/7

9) (x+5)/3 = (-x+2)/5
5(x+5)=3(-x+2)
5x + 25 = -3x +6
5x + 3x = 6 - 25
8x = -19
x = -2 3/8

10) 7/(5-x) = 8/(2+x)
7(2 + x) = 8(5 - x)
14 + 7x = 40 - 8x
7x + 8x = 40 - 14
15x = 26
x=1 11/15