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22000-((16000/12)*x) = 100 // - 100
22000-((16000/12)*x)-100 = 0
(-4000/3)*x-100+22000 = 0
21900-4000/3*x = 0 // - 21900
-4000/3*x = -21900 // : -4000/3
x = -21900/(-4000/3)
x = 657/40
x = 657/40
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