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3*x+9 = 90/11 // - 90/11
3*x-(90/11)+9 = 0
3*x-90/11+9 = 0
3*x+9/11 = 0 // - 9/11
3*x = -9/11 // : 3
x = -9/11/3
x = -3/11
x = -3/11
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