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13*x-(20*x) = 1/4 // - 1/4
13*x-(20*x)-(1/4) = 0
13*x-20*x-1/4 = 0
-7*x-1/4 = 0 // + 1/4
-7*x = 1/4 // : -7
x = 1/4/(-7)
x = -1/28
x = -1/28
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