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9*x = 3/4+6/9-9.9 // - 3/4+6/9-9.9
9*x-(3/4)-(6/9)+9.9 = 0
9*x-3/4-2/3+9.9 = 0
9*x+8.48333333 = 0 // - 8.48333333
9*x = -8.48333333 // : 9
x = -8.48333333/9
x = -0.94259259
x = -0.94259259
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