8 ( 1 - 0,5 х) = -6 (9-2х)

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Let's distribute and simplify both sides of the equation:

8 - 4x = -54 + 12x

Now, let's gather like terms:

16x = -62

Dividing by 16 on both sides, we get:

x = -62/16

Thus, x = -3.875