Answer: B
Explanation: if you look at A and try to combine like terms, you will add the -x on the right side the the one on the left, cancelling out the x on the left. then you have 0=x+0, and unless x=0, it is not true.
With B, when you add x to the -x, you cancel it out, giving you 0=0, which is true. hope it helps!
Answer:
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Answer:
Step-by-step explanation:
Answer:
x=40
Step-by-step explanation:
120=3x due to vertical angles theorem
120/3
40
x=40
