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9-((5*x)/15) = 3/4 // - 3/4
9-((5*x)/15)-(3/4) = 0
(-1/3)*x-3/4+9 = 0
33/4-1/3*x = 0 // - 33/4
-1/3*x = -33/4 // : -1/3
x = -33/4/(-1/3)
x = 99/4
x = 99/4
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