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(1/7)*x+(1/12)*x = 1/4 // - 1/4
(1/7)*x+(1/12)*x-(1/4) = 0
(1/7)*x+(1/12)*x-1/4 = 0
19/84*x-1/4 = 0 // + 1/4
19/84*x = 1/4 // : 19/84
x = 1/4/19/84
x = 21/19
x = 21/19
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