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81-((3/4)*x) = (11/2)*x // - (11/2)*x
81-((3/4)*x)-((11/2)*x) = 0
(-3/4)*x+(-11/2)*x+81 = 0
81-25/4*x = 0 // - 81
-25/4*x = -81 // : -25/4
x = -81/(-25/4)
x = 324/25
x = 324/25
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