21+21+17=59
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Are you trying to say 17 + 6 + (7-9) ? = 21
-4 + 21 = 17
-21
2z+17=21 subtract 17 from both sides. 2z=4 divide both sides by 2 z=2
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.