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280
To simplify 280/315, we first look for common factors between the numerator (280) and the denominator (315). Both numbers are divisible by 5, so we can divide both by 5 to get 56/63. Next, we see that both 56 and 63 are divisible by 7, so dividing both by 7 gives us the simplified fraction of 8/9. Therefore, 280/315 simplified is 8/9.
280-45 = 235
14 * 20 = 280
The LCM is 280.