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x in (-oo:+oo)
(4*x)/100+(12.5*y)/100 = 231770 // - 231770
(4*x)/100+(12.5*y)/100-231770 = 0
1/25*x+0.125*y-231770 = 0 // - 0.125*y-231770
1/25*x = -(0.125*y-231770) // : 1/25
x = (-(0.125*y-231770))/1/25
x = 25*(231770-(0.125*y))
x = 25*(231770-(0.125*y))
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