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If 2x = -4, then we can solve for x by dividing both sides of the equation by 2:
(2x)/2 = -4/2
x = -2
Now that we have the value of x, we can find the value of 8x by substituting x = -2 into the equation:
8x = 8(-2)
8x = -16
Therefore, the value of 8x is -16.