$\frac{x + 8}{2} + \frac{3 - 2x}{5} = 3$ |*10
5(x + 8) + 2(3 − 2x) = 30
5x + 40 + 6 − 4x = 30
x = 30 − 40 − 6
x = −16

$\frac{x - 3}{2} + \frac{2x - 4}{3} = -1$ |*6
6(x − 3) + 2(2x − 4) = −6
6x − 18 + 4x − 8 = −6
10x = −6 + 18 + 8
10x = 20
x = 2

$\frac{3x - 1}{5} - \frac{x + 2}{3} = 1$ |*15
3(3x − 1) − 5(x + 2) = 15
9x − 3 − 5x − 10 = 15
4x = 15 + 10 + 3
4x = 28
x = 7

$\frac{4x - 3}{4} + \frac{1 - x}{3} = -2$ |*12
3(4x − 3) + 4(1 − x) = −24
12x − 9 + 4 − 4x = −24
8x = −24 + 9 − 4
8x = −19
$x = -\frac{19}{8}$
$x = -2\frac{3}{8}$