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x in (-oo:+oo)
x+(12.36*x)/100 = 87640 // - 87640
x+(12.36*x)/100-87640 = 0
1.1236*x-87640 = 0 // + 87640
1.1236*x = 87640 // : 1.1236
x = 87640/1.1236
x = 77999.28800285
x = 77999.28800285
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