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9-4*x-((4/5)*x) = -51/5 // + -51/5
9-4*x-((4/5)*x)-(-51/5) = 0
(-4/5)*x-4*x+51/5+9 = 0
96/5-24/5*x = 0 // - 96/5
-24/5*x = -96/5 // : -24/5
x = -96/5/(-24/5)
x = 4
x = 4
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