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6*x+(5/(-4))*x-5 = 4 // - 4
6*x+(5/(-4))*x-5-4 = 0
19/4*x-9 = 0 // + 9
19/4*x = 9 // : 19/4
x = 9/19/4
x = 36/19
x = 36/19
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