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Let me assume that this equation is -2 -8x = 40

It's usually best to move all the purely numerical items to one side first. Let me move the -2. Then, to do this I add 2 to both sides.

-2 - 8x +2 = -8x = 40 + 2 = 42 or -8x = 42

Now, to yield x 'by itself' let me divide both sides by -8.

(-8x)/-8 = x = 42/(-8) = -21/4 or x = -21/4

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10y ago
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Q: How do you find the value of x in -2-8 x 40?
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