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x in (-oo:+oo)
x-((21*x)/100) = 2100000 // - 2100000
x-((21*x)/100)-2100000 = 0
x+(-21/100)*x-2100000 = 0
79/100*x-2100000 = 0 // + 2100000
79/100*x = 2100000 // : 79/100
x = 2100000/79/100
x = 210000000/79
x = 210000000/79
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