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X+(9*x)/10+3/5 = 3*x-(1/3) // - 3*x-(1/3)
X+(9*x)/10-(3*x)+3/5+1/3 = 0
X+(9*x)/10-3*x+3/5+1/3 = 0
X-21/10*x+14/15 = 0 // - X+14/15
-21/10*x = -(X+14/15) // : -21/10
x = (-(X+14/15))/(-21/10)
x = 10/21*(X+14/15)
x = 10/21*(X+14/15)
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