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411/35 = 3*x+(3/7)*x+9 // - 3*x+(3/7)*x+9
411/35-(3*x)-((3/7)*x)-9 = 0
(-3/7)*x-3*x+411/35-9 = 0
96/35-24/7*x = 0 // - 96/35
-24/7*x = -96/35 // : -24/7
x = -96/35/(-24/7)
x = 4/5
x = 4/5
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