This website should help you understand more on your question!
http://www.sparknotes.com/math/algebra1/inequalities/section4/
Hope this helped!
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Answer:
x = -9
Step-by-step explanation:
let the number = x
So x ÷ -3 = x + 12
Mulitply both sides by -3: x = -3x -36
Add 3x to both sides: 4x = -36
Divide both sides by 4: x = -9
AB/BC = 3/9 = 1/3
answer
True