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9/4-x-(1/2) = (5*x)/6 // - (5*x)/6
9/4-x-((5*x)/6)-(1/2) = 0
(-5/6)*x-x+9/4-1/2 = 0
7/4-11/6*x = 0 // - 7/4
-11/6*x = -7/4 // : -11/6
x = -7/4/(-11/6)
x = 21/22
x = 21/22
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