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13 is a factor of 52 so all we need is the LCM of 52 & 24: 24 = 2 x 2 x 2 x 3; 52 = 2 x 2 x 13; LCM = 13 x 24 = 312
First sum the terms with x: 9x + (-3)x = 6 x. Then sum the terms without x: -11 + (-13)x = -24. Then 6x - 24 =0 or x = 24/6 = 4
x - 7 - 4 = 13 (-7 - 4 = -13) x - 11 = 13 add 11 to both sides x = 24
24 x 32 x 13
24 x 5 x 13 = 1040