So :

?
First, you want to bring everything together on the top of the fraction.
12=24/2 so you can have

Add like terms -- 12 +24 = 36

Now we are at

Which is the lowest possible simplified version while remaining at exact value.
Feel free to check my math! I kinda did this off the top of my head.
Answer:
-2.1
Step-by-step explanation:
3.4 minus -5.5
4/5 * 5/6 = 4/6 = 2/3
She uses 2/3 yards of lace
Since this is this equation has an absolute value than anything in the absolute value is positive.
y=|4x+2|
y=|6x|
y=6x