ed mod n = 1
ed = kn + 1 for integer k
so d = (kn + 1)/e for integer k.
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To find what times 5 equals 400, you can set up the equation as x * 5 = 400. To solve for x, you would divide both sides of the equation by 5, giving you x = 400 / 5. Therefore, the value of x that satisfies the equation is x = 80.
You would take 2 and replace it for x in your other equation and solve.
This equation is unsolvable since there are two unknowns and only one equation. You would require a second equation in order to solve it.
You'd need another equation to sub in
To find the number that, when multiplied by 7, equals 105, you can set up an equation: 7x = 105. To solve for x, you would divide both sides by 7, giving you x = 105 / 7 = 15. Therefore, 7 times 15 equals 105.