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(2/7)*x-4 = 6*x-(7/5) // - 6*x-(7/5)
(2/7)*x-(6*x)+7/5-4 = 0
(2/7)*x-6*x+7/5-4 = 0
-40/7*x-13/5 = 0 // + 13/5
-40/7*x = 13/5 // : -40/7
x = 13/5/(-40/7)
x = -91/200
x = -91/200
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