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x in (-oo:+oo)
x-((18/100)*x) = 16.4 // - 16.4
x-((18/100)*x)-16.4 = 0
x+(-9/50)*x-16.4 = 0
41/50*x-16.4 = 0 // + 16.4
41/50*x = 16.4 // : 41/50
x = 16.4/41/50
x = 20
x = 20
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