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7/8-4*x = -121/8 // + -121/8
7/8-4*x-(-121/8) = 0
7/8-4*x+121/8 = 0
16-4*x = 0 // - 16
-4*x = -16 // : -4
x = -16/(-4)
x = 4
x = 4
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