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x in (-oo:+oo)
x-((15*x)/100) = 193.8 // - 193.8
x-((15*x)/100)-193.8 = 0
x+(-3/20)*x-193.8 = 0
17/20*x-193.8 = 0 // + 193.8
17/20*x = 193.8 // : 17/20
x = 193.8/17/20
x = 228
x = 228
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