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(6/7)*x+9 = 135/14 // - 135/14
(6/7)*x-(135/14)+9 = 0
(6/7)*x-135/14+9 = 0
6/7*x-9/14 = 0 // + 9/14
6/7*x = 9/14 // : 6/7
x = 9/14/6/7
x = 3/4
x = 3/4
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