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(5/4)*x-(7*x) = 6 // - 6
(5/4)*x-(7*x)-6 = 0
(5/4)*x-7*x-6 = 0
-23/4*x-6 = 0 // + 6
-23/4*x = 6 // : -23/4
x = 6/(-23/4)
x = -24/23
x = -24/23
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