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(6/7)*x-(2/5) = -(7*x)-164/35 // + -(7*x)-164/35
(6/7)*x+7*x-(2/5)-(-164/35) = 0
(6/7)*x+7*x-2/5+164/35 = 0
55/7*x+30/7 = 0 // - 30/7
55/7*x = -30/7 // : 55/7
x = -30/7/55/7
x = -6/11
x = -6/11
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