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-63/5 = (-1/7)*x-(5*x)-9 // - (-1/7)*x-(5*x)-9
5*x-((-1/7)*x)-63/5+9 = 0
(1/7)*x+5*x-63/5+9 = 0
36/7*x-18/5 = 0 // + 18/5
36/7*x = 18/5 // : 36/7
x = 18/5/36/7
x = 7/10
x = 7/10
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