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-0.8(x+8)=4
We move all terms to the left:
-0.8(x+8)-(4)=0
We multiply parentheses
-0.8x-6.4-4=0
We add all the numbers together, and all the variables
-0.8x-10.4=0
We move all terms containing x to the left, all other terms to the right
-0.8x=10.4
x=10.4/-0.8
x=-13
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