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x in (-oo:+oo)
x-((6.48/100)*x) = 600 // - 600
x-((6.48/100)*x)-600 = 0
x-0.0648*x-600 = 0
0.9352*x-600 = 0 // + 600
0.9352*x = 600 // : 0.9352
x = 600/0.9352
x = 641.57399487
x = 641.57399487
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