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3*x-9 = -57/7 // + -57/7
3*x-(-57/7)-9 = 0
3*x+57/7-9 = 0
3*x-6/7 = 0 // + 6/7
3*x = 6/7 // : 3
x = 6/7/3
x = 2/7
x = 2/7
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