2730
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x - 7 = 13 Therefore, x = 13 + 7 x = 20
5x - 17 = x + 7 4x - 17 = 7 4x = 24 x = 6 Check it. 30 - 17 = 13 It checks.
It's the same process as finding the least common multiple. Example: 7/30 + 13/42 Factor them. 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Combine the factors, eliminating duplicates. 2 x 3 x 5 x 7 = 210, the LCM Since 210 is the lowest common denominator, we can proceed to add them. 7/30 = 49/210 13/42 = 65/210 7/30 + 13/42 = 114/210 or 19/35 in lowest terms.
7 x 13 = 9113*7=91
30*13 = 390