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(3/4)*x+9 = 115/12-x // - 115/12-x
(3/4)*x+x-(115/12)+9 = 0
(3/4)*x+x-115/12+9 = 0
7/4*x-7/12 = 0 // + 7/12
7/4*x = 7/12 // : 7/4
x = 7/12/7/4
x = 1/3
x = 1/3
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