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-7 + 28 = 21
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7 + 7 + 7 + 7 = 28
28?
n = 7. 3(7) + 7 = 28. 21+7=28
3x + 7 = -4x + 28 implies 7x + 7 = 28
2/7 plus 1/4 is the same as 8/28+7/28 = 15/28