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x in (-oo:+oo)
(5/100)*x = 6720 // - 6720
(5/100)*x-6720 = 0
1/20*x-6720 = 0 // + 6720
1/20*x = 6720 // : 1/20
x = 6720/1/20
x = 134400
x = 134400
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