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(6/7)*x-9 = -27/7 // + -27/7
(6/7)*x-(-27/7)-9 = 0
(6/7)*x+27/7-9 = 0
6/7*x-36/7 = 0 // + 36/7
6/7*x = 36/7 // : 6/7
x = 36/7/6/7
x = 6
x = 6
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