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3-((5*x)/4) = x+5/9 // - x+5/9
3-((5*x)/4)-x-(5/9) = 0
(-5/4)*x-x-5/9+3 = 0
22/9-9/4*x = 0 // - 22/9
-9/4*x = -22/9 // : -9/4
x = -22/9/(-9/4)
x = 88/81
x = 88/81
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