-3/8x=0,375; x×(-3 5/17)=28; 3,2x=-1 1/15

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To solve the equations:

1) -3/8x = 0.375
First, we can multiply both sides by -8 to get rid of the fraction:
x = 0.375 * (-8)
x = -3

2) x (-3 5/17) = 28
Convert -3 5/17 to an improper fraction:
-3 5/17 = -(3 17 + 5)/17 = -56/17

Now, we can plug in -56/17 for x in the equation and solve for x:
x (-56/17) = 28
x = 28 / (-56/17)
x = 28 (-17/56)
x = -8.5

3) 3.2x = -1 1/15
Convert -1 1/15 to an improper fraction:
-1 1/15 = -(1 * 15 + 1)/15 = -16/15

Now, we can solve for x in the equation:
x = (-16/15) / 3.2
x = -16/15 * (1/3.2)
x ≈ -1.6667

Therefore, the solutions to the equations are x = -3, x = -8.5, and x ≈ -1.6667.