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(3*x)/20+(5*x)/7-(1/14) = 0
(3*x)/20+(5*x)/7-1/14 = 0
121/140*x-1/14 = 0 // + 1/14
121/140*x = 1/14 // : 121/140
x = 1/14/121/140
x = 10/121
x = 10/121
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