The answer is 117. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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9 + 5x = -4x + 63 9 + 9x = 63 9x = 54 9x/9 = 54/9 x = 6
6/7 x 9/9 = 54/63 80/9 x 7/7 = 560/63 54/63 + 560/63 = 614/63
54/63 = 6/7 simplified
The Lcm of 18 54 and 63 is: 378
63 is closer