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1. I did it this way, but it doesn't check right

_ _
2 2
+10 +10
y = 25

Check: 2 (10-15) = 30
-30 is not equal to 30!!!

  • Math -

    You need to clarify. Use parenthese; I can't tell where the dividion takes place from your post.

  • Math -

    Well y = to 15 right? 2(15-10)= 18?

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