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Answer: 60
Explanation:
When you have 2 parrallel lines the angles will either be = or =180 in this case =180
so
A+B=180
x + 12 + x + 48 = 180
2x + 60 =180
2x = 120
x=60
Answer:
x=80
x+12 and x+48 must equal 180 so 60 is the answer
60+12=72
60+48=108
72+108=180