What number should be added to –5/7 to get –2/3?
Let's call the number we need to add "x".
We want to find x such that:
-5/7 + x = -2/3
To solve for x, we can start by getting rid of the denominators by multiplying both sides of the equation by the least common multiple of 7 and 3, which is 21:
21(-5/7 + x) = 21(-2/3)
Simplifying both sides:
-15 + 21x = -14
Adding 15 to both sides:
21x = 1
Dividing both sides by 21:
x = 1/21
So the number that should be added to -5/7 to get -2/3 is 1/21.
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