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196800-x = (5*x)/100 // - (5*x)/100
196800-x-((5*x)/100) = 0
(-1/20)*x-x+196800 = 0
196800-21/20*x = 0 // - 196800
-21/20*x = -196800 // : -21/20
x = -196800/(-21/20)
x = 1312000/7
x = 1312000/7
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