431.2 is the answer to your question
Sum of all adjacent angles is 180°.
3x + 12 + x = 180
4x + 12 = 180
4x = 168
x = 42°
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Answer: x = 42°
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<span>f(x)=f(x−1)+2 this is one example =)</span>
Answer:
It sucks
Step-by-step explanation:
