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(3/7)*x-(6*x)+7 = -185/7 // + -185/7
(3/7)*x-(6*x)-(-185/7)+7 = 0
(3/7)*x-6*x+185/7+7 = 0
234/7-39/7*x = 0 // - 234/7
-39/7*x = -234/7 // : -39/7
x = -234/7/(-39/7)
x = 6
x = 6
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