Answer:
720=130+102+120+134+2x+x
720=232+254+3x
720=486+3x
720-486=3x
234=3x
234÷3=x
78=x
The answer is obviously -42.
Explanation:
You add all the values on the shape to get 3x+486=360. You then subtract 486 on both sides to get 3x=-126. From there, you divide by 3 to get -42.
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