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(19*x)/7 = 57/49 // - 57/49
(19*x)/7-(57/49) = 0
(19*x)/7-57/49 = 0
19/7*x-57/49 = 0 // + 57/49
19/7*x = 57/49 // : 19/7
x = 57/49/19/7
x = 3/7
x = 3/7
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