First, subtract 12 and get it on the other side.
So you will get this:
-4/5(x+15)=-8
Next, you'll want to distribute the -4/5:
-4/5x-12=-8
Add 12
-4/5x=4
Multiply -4/5 (Usually you would divide here, but since it's a fraction, multiplying is simpler)
x=-3.2 (or -16/5)
They have advanced weapons and are used to war i suppose.
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Value of x = 19
(8x - 20) = (5x + 37)
3x = 57
x = 19
No because it is equal to -7.5 I think