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X/4-x-(6/8) = 9/8 // - 9/8
X/4-x-(6/8)-(9/8) = 0
X/4-x-3/4-9/8 = 0
1/4*X-x-15/8 = 0 // - 1/4*X-15/8
-x = -(1/4*X-15/8) // * -1
x = 1/4*X-15/8
x = 1/4*X-15/8
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