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X/11 = (9*x)/10-89 // - (9*x)/10-89
X/11-((9*x)/10)+89 = 0
X/11+(-9/10)*x+89 = 0
1/11*X-9/10*x+89 = 0 // - 1/11*X+89
-9/10*x = -(1/11*X+89) // : -9/10
x = (-(1/11*X+89))/(-9/10)
x = 10/9*(1/11*X+89)
x = 10/9*(1/11*X+89)
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