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15/4-(2*x) = 127/8 // - 127/8
15/4-(2*x)-(127/8) = 0
15/4-2*x-127/8 = 0
-2*x-97/8 = 0 // + 97/8
-2*x = 97/8 // : -2
x = 97/8/(-2)
x = -97/16
x = -97/16
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