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Answer:
15 and 3
Step-by-step explanation:
[tex]x+y=18\\x-y=12[/tex]
the equations are added:
[tex]2x=30[/tex]
[tex]x=30/2=15[/tex]
[tex]15+y=18\\y=18-15[/tex]
[tex]y=3[/tex]
Hope this helps