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(1/6)*x+(2/7)*x-1/10 = 53/420 // - 53/420
(1/6)*x+(2/7)*x-1/10-(53/420) = 0
(1/6)*x+(2/7)*x-1/10-53/420 = 0
19/42*x-19/84 = 0 // + 19/84
19/42*x = 19/84 // : 19/42
x = 19/84/19/42
x = 1/2
x = 1/2
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