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7/8-5*x = 247/8 // - 247/8
7/8-5*x-(247/8) = 0
7/8-5*x-247/8 = 0
-5*x-30 = 0 // + 30
-5*x = 30 // : -5
x = 30/(-5)
x = -6
x = -6
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