0
Anonymous
You can't.
17 + 2n = 21 + 2n gives: 2n = 4 + 2n which gives 0=4 which is not possible so the sum is not solveable.
Wiki User
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A + 9 = 21 A = 21 - 9 A = 12
5
depends what 'a' =
-3+y=17+1 im assuming solve for y?-3+y=18 add 3 to both sidesy=21
-21