Answer:
12. 3a+7 = 25
3a = 25-7
3a = 18
a = 18/3
a= 6
13. PR
14. linear expression in one variable
15. 110°
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Answer:
12. 3a+7 = 25
3a = 25-7
3a = 18
a = 18/3
a= 6
13. PR
14. linear expression in one variable
15. 110°